PNG benchmark: web lossless optimization

last updated: 08/09/2025

this test shows how PNG optimizers use automatic lossless reductions for web usage by using the default or the same command — point is to highlight heuristics and transforms. evaluations are done on specific image test sets

as the process is run with the default (or same) command, it would be possible for some tools to achieve 'better' result with specific flags for some files (but not always)
speed is measured file per file, with and without mt if significant — this would not be representative of the maximum speed if the tool handle (or was built in mind with) mp
top score on one image set does not mean the tool always outperforms other

PNG: all are 8 bits/sample — or 1, 2, 4, 8 bits/pixels for paletted, critical chunks only
MAC: Intel(R) Core(TM) i5-12400 (6C, 12T), 2.50 GHz — 16,0 Go DDR4 RAM — WD Black SN750 1 To — Windows 11 Pro
NTE: this document is generated automatically without any human verification

you can sort results (test, time (s), saved (MB)) — ascending/descending with javascript enabled
you can see details by clicking on each image test sets

tools

tool	version
advdef.exe	2.5 - 2.6 *
advpng.exe	2.5 - 2.6 *
ect.exe	0.9.5
optipng.exe	0.7.7 - 7.9.1 *
oxipng.exe	9.1.5
pingo.exe	1.25
pngoptimizer.exe	2.7 *
pngout.exe	02/13/2015 *
pngwolf.exe	1.1.2 *
truepng.exe	0.6.2.5 *
zopflipng.exe	831773b *

* results not updated, copied from 13/06/2023 benchmark. same/new version does not bring any compression improvement

results

alpha - files

results

test	time (s)	saved (MB)
advdef -z2	5.61	0.437
advdef -z3	17.50	0.437
advdef -z4	147.14	0.457
advpng -z2	4.98	0.406
advpng -z3	15.95	0.404
advpng -z4	173.58	0.423
ect -1	2.93	3.342
ect -3	9.07	3.583
ect -3 (mt)	6.09	3.578
ect -5	13.70	3.580
ect -5 (mt)	8.56	3.580
ect -9	84.58	3.604
ect -9 (mt)	30.33	3.603
optipng -o2	20.48	1.070
optipng -o7	292.20	1.157
oxipng -ao2 (mt)	5.89	3.589
oxipng -ao6	72.75	3.623
oxipng -ao6 (mt)	12.01	3.623
oxipng -Zao6 (mt)	177.18	3.634
pingo -s0 -l	3.17	3.471
pingo -s1 -l	4.77	3.558
pingo -s2 -l	7.43	3.591
pingo -s3 -l	11.76	3.603
pingo -s3 -l (mt)	6.15	3.603
pingo -s4 -l	16.13	3.616
pingo -s4 -l (mt)	7.61	3.616
pngoptimizer (mt)	8.03	3.147
pngout	112.08	0.458
pngwolf	169.22	3.247
truepng -o1	20.05	3.471
truepng -o4	301.35	3.511
zopflipng	191.32	3.537

bitdepth-4 - files

test	time (s)	saved (MB)
advdef -z2	2.10	0.138
advdef -z3	5.18	0.140
advdef -z4	23.36	0.143
advpng -z2	2.10	0.138
advpng -z3	5.01	0.140
advpng -z4	23.44	0.143
ect -1	0.23	0.141
ect -3	1.28	0.160
ect -3 (mt)	0.85	0.160
ect -5	1.96	0.162
ect -5 (mt)	1.25	0.162
ect -9	15.44	0.163
ect -9 (mt)	7.84	0.163
optipng -o2	2.54	0.143
optipng -o7	23.07	0.143
oxipng -ao2 (mt)	0.94	0.157
oxipng -ao6	12.76	0.160
oxipng -ao6 (mt)	2.30	0.160
oxipng -Zao6 (mt)	16.99	0.162
pingo -s0 -l	0.38	0.136
pingo -s1 -l	0.52	0.149
pingo -s2 -l	0.86	0.157
pingo -s3 -l	4.05	0.161
pingo -s3 -l (mt)	1.86	0.161
pingo -s4 -l	7.71	0.162
pingo -s4 -l (mt)	3.31	0.162
pngoptimizer (mt)	1.32	0.141
pngout	32.97	0.143
pngwolf	36.48	0.148
truepng -o1	7.75	0.146
truepng -o4	22.85	0.147
zopflipng	15.45	0.162

bitdepth-8 - files

test	time (s)	saved (MB)
advdef -z2	2.43	0.190
advdef -z3	6.10	0.190
advdef -z4	15.23	0.194
advpng -z2	4.50	0.210
advpng -z3	11.80	0.212
advpng -z4	32.88	0.215
ect -1	0.48	0.146
ect -3	2.44	0.190
ect -3 (mt)	1.44	0.189
ect -5	3.32	0.193
ect -5 (mt)	1.76	0.193
ect -9	24.59	0.196
ect -9 (mt)	9.25	0.196
optipng -o2	6.57	0.143
optipng -o7	63.42	0.143
oxipng -ao2 (mt)	2.28	0.191
oxipng -ao6	35.40	0.201
oxipng -ao6 (mt)	6.23	0.201
oxipng -Zao6 (mt)	33.54	0.206
pingo -s0 -l	0.80	0.139
pingo -s1 -l	1.22	0.173
pingo -s2 -l	1.87	0.188
pingo -s3 -l	6.73	0.209
pingo -s3 -l (mt)	3.07	0.209
pingo -s4 -l	11.95	0.215
pingo -s4 -l (mt)	4.61	0.215
pngoptimizer (mt)	3.63	0.144
pngout	38.85	0.188
pngwolf	33.99	0.195
truepng -o1	17.75	0.142
truepng -o4	102.70	0.147
zopflipng	22.06	0.194

colortype-0 - files

test	time (s)	saved (MB)
advdef -z2	6.54	0.232
advdef -z3	14.35	0.236
advdef -z4	61.20	0.265
advpng -z2	1.70	0.000
advpng -z3	1.63	0.000
advpng -z4	1.67	0.000
ect -1	2.47	1.067
ect -3	7.75	1.093
ect -3 (mt)	6.48	1.085
ect -5	12.67	1.090
ect -5 (mt)	10.14	1.090
ect -9	65.98	1.107
ect -9 (mt)	34.36	1.107
optipng -o2	10.10	1.070
optipng -o7	104.63	1.073
oxipng -ao2 (mt)	4.81	1.086
oxipng -ao6	62.03	1.121
oxipng -ao6 (mt)	11.79	1.121
oxipng -Zao6 (mt)	73.40	1.140
pingo -s0 -l	3.05	0.391
pingo -s1 -l	3.61	1.042
pingo -s2 -l	5.55	1.076
pingo -s3 -l	9.92	1.129
pingo -s3 -l (mt)	7.01	1.129
pingo -s4 -l	12.34	1.136
pingo -s4 -l (mt)	8.09	1.136
pngoptimizer (mt)	3.96	1.041
pngout	106.56	0.243
pngwolf	99.17	1.141
truepng -o1	17.69	1.057
truepng -o4	71.94	1.065
zopflipng	71.07	1.133

colortype-2 - files

test	time (s)	saved (MB)
advdef -z2	12.49	0.583
advdef -z3	28.42	0.596
advdef -z4	123.54	0.649
advpng -z2	12.20	0.623
advpng -z3	27.04	0.634
advpng -z4	119.63	0.686
ect -1	3.91	2.925
ect -3	15.85	3.296
ect -3 (mt)	11.03	3.284
ect -5	25.02	3.397
ect -5 (mt)	16.29	3.397
ect -9	147.94	3.459
ect -9 (mt)	62.15	3.458
optipng -o2	19.21	3.043
optipng -o7	259.71	3.103
oxipng -ao2 (mt)	8.20	3.313
oxipng -ao6	129.01	3.377
oxipng -ao6 (mt)	21.97	3.377
oxipng -Zao6 (mt)	206.28	3.429
pingo -s0 -l	5.22	3.058
pingo -s1 -l	5.40	3.182
pingo -s2 -l	11.26	3.281
pingo -s3 -l	21.81	3.345
pingo -s3 -l (mt)	12.58	3.345
pingo -s4 -l	30.91	3.413
pingo -s4 -l (mt)	17.14	3.414
pngoptimizer (mt)	6.71	2.901
pngout	327.05	0.623
pngwolf	212.39	3.406
truepng -o1	17.51	3.083
truepng -o4	171.08	3.156
zopflipng	138.14	3.352

colortype-3 - files

test	time (s)	saved (MB)
advdef -z2	6.61	0.246
advdef -z3	14.35	0.252
advdef -z4	59.83	0.280
advpng -z2	6.53	0.246
advpng -z3	14.19	0.252
advpng -z4	59.33	0.280
ect -1	2.04	0.132
ect -3	7.14	0.250
ect -3 (mt)	5.64	0.243
ect -5	9.02	0.269
ect -5 (mt)	6.24	0.269
ect -9	60.32	0.277
ect -9 (mt)	26.51	0.277
optipng -o2	9.42	0.128
optipng -o7	103.22	0.129
oxipng -ao2 (mt)	4.72	0.531
oxipng -ao6	62.89	0.587
oxipng -ao6 (mt)	11.71	0.587
oxipng -Zao6 (mt)	75.04	0.603
pingo -s0 -l	2.41	0.338
pingo -s1 -l	5.70	0.527
pingo -s2 -l	7.48	0.568
pingo -s3 -l	12.39	0.626
pingo -s3 -l (mt)	9.05	0.626
pingo -s4 -l	16.32	0.651
pingo -s4 -l (mt)	10.28	0.651
pngoptimizer (mt)	6.65	0.436
pngout	88.68	0.264
pngwolf	110.79	0.281
truepng -o1	20.72	0.411
truepng -o4	164.47	0.428
zopflipng	83.40	0.274

colortype-4 - files

test	time (s)	saved (MB)
advdef -z2	8.42	0.708
advdef -z3	23.17	0.693
advdef -z4	235.74	0.724
advpng -z2	1.59	0.000
advpng -z3	1.59	0.000
advpng -z4	1.57	0.000
ect -1	3.28	1.451
ect -3	11.27	1.587
ect -3 (mt)	8.77	1.563
ect -5	19.29	1.606
ect -5 (mt)	14.67	1.606
ect -9	97.66	1.676
ect -9 (mt)	48.78	1.669
optipng -o2	22.44	1.456
optipng -o7	272.70	1.461
oxipng -ao2 (mt)	7.06	1.674
oxipng -ao6	107.30	1.719
oxipng -ao6 (mt)	17.66	1.719
oxipng -Zao6 (mt)	159.22	1.740
pingo -s0 -l	3.83	1.456
pingo -s1 -l	5.90	1.638
pingo -s2 -l	8.02	1.674
pingo -s3 -l	15.24	1.670
pingo -s3 -l (mt)	10.42	1.670
pingo -s4 -l	19.58	1.698
pingo -s4 -l (mt)	11.99	1.698
pngoptimizer (mt)	7.76	1.379
pngout	1263.89	0.717
pngwolf	233.45	1.673
truepng -o1	15.00	1.480
truepng -o4	207.27	1.503
zopflipng	115.86	1.615

colortype-6 - files

test	time (s)	saved (MB)
advdef -z2	10.26	0.971
advdef -z3	35.25	0.941
advdef -z4	271.08	1.007
advpng -z2	10.16	0.971
advpng -z3	34.58	0.941
advpng -z4	267.16	1.007
ect -1	4.74	3.295
ect -3	17.81	3.966
ect -3 (mt)	12.17	3.954
ect -5	26.58	3.994
ect -5 (mt)	18.03	3.994
ect -9	148.58	4.043
ect -9 (mt)	66.89	4.041
optipng -o2	28.89	3.387
optipng -o7	393.91	3.436
oxipng -ao2 (mt)	9.93	3.987
oxipng -ao6	160.11	4.032
oxipng -ao6 (mt)	27.20	4.032
oxipng -Zao6 (mt)	242.65	4.083
pingo -s0 -l	7.94	3.687
pingo -s1 -l	8.07	3.872
pingo -s2 -l	13.60	3.969
pingo -s3 -l	24.53	4.023
pingo -s3 -l (mt)	14.95	4.023
pingo -s4 -l	34.75	4.055
pingo -s4 -l (mt)	18.79	4.056
pngoptimizer (mt)	9.75	3.246
pngout	1097.19	0.996
pngwolf	249.22	3.905
truepng -o1	24.85	3.476
truepng -o4	354.55	3.582
zopflipng	171.44	3.789

filter - files

test	time (s)	saved (MB)
advdef -z2	4.37	0.004
advdef -z3	17.05	0.003
advdef -z4	43.18	0.006
advpng -z2	4.13	0.010
advpng -z3	16.30	0.008
advpng -z4	41.05	0.013
ect -1	1.33	0.155
ect -3	5.17	0.165
ect -3 (mt)	2.97	0.162
ect -5	7.95	0.101
ect -5 (mt)	4.07	0.101
ect -9	63.51	0.109
ect -9 (mt)	21.00	0.111
optipng -o2	9.98	0.192
optipng -o7	163.06	0.199
oxipng -ao2 (mt)	4.06	0.321
oxipng -ao6	66.35	0.354
oxipng -ao6 (mt)	10.79	0.354
oxipng -Zao6 (mt)	99.94	0.378
pingo -s0 -l	3.39	0.201
pingo -s1 -l	3.42	0.288
pingo -s2 -l	5.29	0.329
pingo -s3 -l	10.16	0.350
pingo -s3 -l (mt)	5.01	0.350
pingo -s4 -l	13.53	0.361
pingo -s4 -l (mt)	5.90	0.361
pngoptimizer (mt)	3.61	0.166
pngout	351.46	0.304
pngwolf	80.38	0.214
truepng -o1	10.12	0.206
truepng -o4	219.73	0.233
zopflipng	57.87	0.260

content-chart - files

test	time (s)	saved (MB)
advdef -z2	4.14	0.355
advdef -z3	12.93	0.351
advdef -z4	70.86	0.375
advpng -z2	4.02	0.630
advpng -z3	12.59	0.626
advpng -z4	70.79	0.648
ect -1	0.86	0.583
ect -3	4.32	0.700
ect -3 (mt)	2.72	0.695
ect -5	7.14	0.718
ect -5 (mt)	4.03	0.718
ect -9	55.76	0.724
ect -9 (mt)	21.35	0.724
optipng -o2	9.67	0.575
optipng -o7	97.21	0.575
oxipng -ao2 (mt)	3.14	0.708
oxipng -ao6	42.20	0.742
oxipng -ao6 (mt)	7.71	0.742
oxipng -Zao6 (mt)	140.55	0.760
pingo -s0 -l	1.68	0.601
pingo -s1 -l	2.09	0.660
pingo -s2 -l	3.84	0.717
pingo -s3 -l	7.17	0.746
pingo -s3 -l (mt)	4.09	0.746
pingo -s4 -l	9.17	0.749
pingo -s4 -l (mt)	4.78	0.749
pngoptimizer (mt)	2.58	0.543
pngout	277.42	0.370
pngwolf	112.65	0.762
truepng -o1	6.62	0.587
truepng -o4	65.83	0.658
zopflipng	81.24	0.719

content-flat - files

test	time (s)	saved (MB)
advdef -z2	5.96	0.318
advdef -z3	19.40	0.312
advdef -z4	89.50	0.341
advpng -z2	5.90	0.318
advpng -z3	18.81	0.312
advpng -z4	88.34	0.341
ect -1	0.90	1.469
ect -3	6.85	1.523
ect -3 (mt)	4.57	1.523
ect -5	11.63	1.539
ect -5 (mt)	7.61	1.539
ect -9	88.57	1.541
ect -9 (mt)	44.11	1.541
optipng -o2	8.16	1.207
optipng -o7	94.43	1.281
oxipng -ao2 (mt)	3.76	1.502
oxipng -ao6	78.74	1.520
oxipng -ao6 (mt)	13.24	1.520
oxipng -Zao6 (mt)	167.71	1.540
pingo -s0 -l	1.87	1.421
pingo -s1 -l	2.09	1.465
pingo -s2 -l	3.95	1.499
pingo -s3 -l	9.15	1.536
pingo -s3 -l (mt)	5.30	1.536
pingo -s4 -l	12.45	1.537
pingo -s4 -l (mt)	6.73	1.537
pngoptimizer (mt)	2.58	1.468
pngout	367.56	0.312
pngwolf	135.42	1.501
truepng -o1	8.47	1.492
truepng -o4	95.83	1.499
zopflipng	93.97	1.507

content-gradient - files

test	time (s)	saved (MB)
advdef -z2	1.69	3.334
advdef -z3	8.11	3.322
advdef -z4	37.05	3.336
advpng -z2	1.32	3.241
advpng -z3	6.74	3.230
advpng -z4	35.89	3.242
ect -1	1.41	4.070
ect -3	3.33	4.116
ect -3 (mt)	2.92	4.116
ect -5	6.11	4.133
ect -5 (mt)	5.68	4.133
ect -9	52.43	4.137
ect -9 (mt)	43.38	4.135
optipng -o2	9.03	4.083
optipng -o7	141.13	4.103
oxipng -ao2 (mt)	2.03	4.113
oxipng -ao6	23.37	4.127
oxipng -ao6 (mt)	4.47	4.127
oxipng -Zao6 (mt)	119.23	4.134
pingo -s0 -l	1.44	4.051
pingo -s1 -l	1.80	4.098
pingo -s2 -l	2.65	4.108
pingo -s3 -l	5.84	4.115
pingo -s3 -l (mt)	4.82	4.115
pingo -s4 -l	7.95	4.115
pingo -s4 -l (mt)	6.44	4.115
pngoptimizer (mt)	3.92	4.059
pngout	68.65	3.567
pngwolf	81.74	4.115
truepng -o1	11.54	4.086
truepng -o4	55.70	4.118
zopflipng	93.28	4.124

content-icons-gradient - files

test	time (s)	saved (MB)
advdef -z2	1.88	0.420
advdef -z3	6.80	0.417
advdef -z4	28.30	0.425
advpng -z2	1.88	0.420
advpng -z3	6.66	0.417
advpng -z4	27.91	0.425
ect -1	1.60	1.000
ect -3	4.31	1.124
ect -3 (mt)	2.90	1.123
ect -5	6.79	1.137
ect -5 (mt)	4.28	1.137
ect -9	41.83	1.157
ect -9 (mt)	15.53	1.154
optipng -o2	16.44	0.988
optipng -o7	205.67	1.009
oxipng -ao2 (mt)	2.79	1.115
oxipng -ao6	37.58	1.140
oxipng -ao6 (mt)	6.24	1.140
oxipng -Zao6 (mt)	101.68	1.149
pingo -s0 -l	1.93	1.010
pingo -s1 -l	2.29	1.094
pingo -s2 -l	3.46	1.124
pingo -s3 -l	6.14	1.128
pingo -s3 -l (mt)	3.36	1.128
pingo -s4 -l	8.79	1.135
pingo -s4 -l (mt)	4.03	1.135
pngoptimizer (mt)	5.48	0.936
pngout	71.68	0.419
pngwolf	89.96	1.135
truepng -o1	11.87	1.017
truepng -o4	206.04	1.051
zopflipng	81.44	1.107

content-icons-realistic - files

test	time (s)	saved (MB)
advdef -z2	1.60	0.411
advdef -z3	6.38	0.415
advdef -z4	23.89	0.423
advpng -z2	1.56	0.411
advpng -z3	6.34	0.415
advpng -z4	23.91	0.423
ect -1	2.14	1.543
ect -3	4.71	1.707
ect -3 (mt)	3.52	1.703
ect -5	7.99	1.717
ect -5 (mt)	5.64	1.717
ect -9	37.70	1.750
ect -9 (mt)	16.43	1.740
optipng -o2	15.19	1.469
optipng -o7	230.63	1.501
oxipng -ao2 (mt)	2.46	1.714
oxipng -ao6	31.22	1.725
oxipng -ao6 (mt)	5.38	1.725
oxipng -Zao6 (mt)	76.53	1.736
pingo -s0 -l	2.56	1.641
pingo -s1 -l	2.40	1.705
pingo -s2 -l	3.31	1.712
pingo -s3 -l	6.08	1.719
pingo -s3 -l (mt)	3.63	1.719
pingo -s4 -l	9.03	1.728
pingo -s4 -l (mt)	4.62	1.728
pngoptimizer (mt)	4.83	1.447
pngout	42.50	0.400
pngwolf	75.69	1.713
truepng -o1	10.43	1.575
truepng -o4	198.51	1.587
zopflipng	58.97	1.659

content-icons-small - files

test	time (s)	saved (MB)
advdef -z2	4.82	0.493
advdef -z3	12.07	0.488
advdef -z4	63.97	0.511
advpng -z2	3.34	0.036
advpng -z3	9.30	0.035
advpng -z4	53.34	0.041
ect -1	2.00	0.535
ect -3	5.74	0.693
ect -3 (mt)	4.77	0.691
ect -5	9.33	0.674
ect -5 (mt)	7.65	0.674
ect -9	48.01	0.685
ect -9 (mt)	25.77	0.684
optipng -o2	15.94	0.415
optipng -o7	178.02	0.423
oxipng -ao2 (mt)	3.52	0.679
oxipng -ao6	43.21	0.696
oxipng -ao6 (mt)	7.75	0.696
oxipng -Zao6 (mt)	83.56	0.715
pingo -s0 -l	2.58	0.575
pingo -s1 -l	3.19	0.656
pingo -s2 -l	5.45	0.686
pingo -s3 -l	8.40	0.702
pingo -s3 -l (mt)	6.07	0.702
pingo -s4 -l	11.14	0.707
pingo -s4 -l (mt)	7.36	0.707
pngoptimizer (mt)	5.29	0.472
pngout	112.36	0.501
pngwolf	94.18	0.697
truepng -o1	10.74	0.543
truepng -o4	184.79	0.574
zopflipng	65.94	0.663

content-icons-small-palette - files

test	time (s)	saved (MB)
advdef -z2	3.82	0.121
advdef -z3	6.19	0.111
advdef -z4	50.58	0.133
advpng -z2	3.57	0.121
advpng -z3	6.21	0.111
advpng -z4	49.66	0.133
ect -1	1.89	0.062
ect -3	3.42	0.118
ect -3 (mt)	3.30	0.118
ect -5	4.05	0.122
ect -5 (mt)	3.77	0.122
ect -9	21.17	0.124
ect -9 (mt)	12.39	0.125
optipng -o2	6.79	0.062
optipng -o7	56.19	0.062
oxipng -ao2 (mt)	2.81	0.125
oxipng -ao6	18.57	0.178
oxipng -ao6 (mt)	5.70	0.178
oxipng -Zao6 (mt)	43.05	0.188
pingo -s0 -l	2.23	0.097
pingo -s1 -l	3.61	0.168
pingo -s2 -l	4.65	0.179
pingo -s3 -l	5.84	0.188
pingo -s3 -l (mt)	5.42	0.188
pingo -s4 -l	6.69	0.206
pingo -s4 -l (mt)	5.40	0.206
pngoptimizer (mt)	6.05	0.095
pngout	16.06	0.122
pngwolf	76.99	0.133
truepng -o1	9.73	0.119
truepng -o4	68.34	0.132
zopflipng	72.16	0.123

content-icons-very-small - files

test	time (s)	saved (MB)
advdef -z2	2.42	0.088
advdef -z3	3.31	0.088
advdef -z4	13.19	0.090
advpng -z2	2.48	0.109
advpng -z3	3.36	0.108
advpng -z4	16.46	0.110
ect -1	1.32	0.100
ect -3	2.21	0.116
ect -3 (mt)	2.48	0.116
ect -5	3.12	0.117
ect -5 (mt)	3.07	0.117
ect -9	19.80	0.118
ect -9 (mt)	17.93	0.118
optipng -o2	3.50	0.102
optipng -o7	17.02	0.102
oxipng -ao2 (mt)	1.72	0.094
oxipng -ao6	9.35	0.117
oxipng -ao6 (mt)	3.23	0.117
oxipng -Zao6 (mt)	20.04	0.118
pingo -s0 -l	1.43	0.096
pingo -s1 -l	1.86	0.113
pingo -s2 -l	2.32	0.117
pingo -s3 -l	2.62	0.119
pingo -s3 -l (mt)	2.70	0.119
pingo -s4 -l	3.26	0.119
pingo -s4 -l (mt)	3.11	0.119
pngoptimizer (mt)	3.06	0.100
pngout	9.77	0.088
pngwolf	28.99	0.110
truepng -o1	4.52	0.108
truepng -o4	18.57	0.108
zopflipng	89.14	0.109

content-low-colors - files

test	time (s)	saved (MB)
advdef -z2	14.98	0.000
advdef -z3	38.38	0.000
advdef -z4	142.32	0.005
advpng -z2	12.74	4.850
advpng -z3	39.32	4.833
advpng -z4	164.33	4.889
ect -1	3.78	4.767
ect -3	11.73	5.277
ect -3 (mt)	8.36	5.272
ect -5	16.60	5.292
ect -5 (mt)	10.81	5.292
ect -9	113.62	5.296
ect -9 (mt)	60.30	5.297
optipng -o2	23.75	4.382
optipng -o7	302.50	4.382
oxipng -ao2 (mt)	10.25	5.250
oxipng -ao6	116.07	5.259
oxipng -ao6 (mt)	24.66	5.259
oxipng -Zao6 (mt)	202.64	5.295
pingo -s0 -l	6.80	5.021
pingo -s1 -l	7.96	5.226
pingo -s2 -l	10.56	5.253
pingo -s3 -l	15.27	5.287
pingo -s3 -l (mt)	9.92	5.287
pingo -s4 -l	18.58	5.291
pingo -s4 -l (mt)	11.61	5.291
pngoptimizer (mt)	11.28	4.703
pngout	505.59	0.271
pngwolf	232.42	5.256
truepng -o1	23.19	4.760
truepng -o4	227.66	4.766
zopflipng	174.88	5.206

content-palettes - files

test	time (s)	saved (MB)
advdef -z2	17.45	0.943
advdef -z3	43.48	0.967
advdef -z4	158.36	1.031
advpng -z2	17.66	0.943
advpng -z3	42.60	0.967
advpng -z4	156.84	1.031
ect -1	6.18	1.903
ect -3	20.86	2.339
ect -3 (mt)	15.24	2.307
ect -5	30.56	2.408
ect -5 (mt)	19.85	2.408
ect -9	187.14	2.587
ect -9 (mt)	74.75	2.586
optipng -o2	43.01	1.924
optipng -o7	554.58	1.947
oxipng -ao2 (mt)	15.10	3.735
oxipng -ao6	216.03	4.187
oxipng -ao6 (mt)	38.57	4.187
oxipng -Zao6 (mt)	310.08	4.250
pingo -s0 -l	8.36	2.481
pingo -s1 -l	20.31	3.749
pingo -s2 -l	26.71	3.890
pingo -s3 -l	45.35	4.075
pingo -s3 -l (mt)	30.70	4.075
pingo -s4 -l	60.74	4.317
pingo -s4 -l (mt)	33.17	4.317
pngoptimizer (mt)	27.30	2.999
pngout	402.59	2.375
pngwolf	296.43	1.064
truepng -o1	90.63	3.666
truepng -o4	582.27	3.762
zopflipng	212.65	2.492

content-palettes-big - files

test	time (s)	saved (MB)
advdef -z2	1.28	0.000
advdef -z3	3.80	0.000
advdef -z4	11.81	0.000
advpng -z2	1.25	0.000
advpng -z3	3.79	0.000
advpng -z4	11.73	0.000
ect -1	0.51	0.000
ect -3	1.64	0.000
ect -3 (mt)	1.01	0.000
ect -5	2.21	0.000
ect -5 (mt)	1.17	0.000
ect -9	14.13	0.000
ect -9 (mt)	4.34	0.000
optipng -o2	2.78	0.000
optipng -o7	52.62	0.000
oxipng -ao2 (mt)	1.30	0.445
oxipng -ao6	17.51	0.458
oxipng -ao6 (mt)	3.29	0.458
oxipng -Zao6 (mt)	29.06	0.468
pingo -s0 -l	0.85	0.339
pingo -s1 -l	2.15	0.402
pingo -s2 -l	2.54	0.441
pingo -s3 -l	4.50	0.452
pingo -s3 -l (mt)	2.53	0.452
pingo -s4 -l	6.37	0.473
pingo -s4 -l (mt)	2.34	0.473
pngoptimizer (mt)	2.95	0.312
pngout	35.12	0.000
pngwolf	23.28	0.000
truepng -o1	9.89	0.343
truepng -o4	76.62	0.358
zopflipng	15.81	0.000

content-pics - files

test	time (s)	saved (MB)
advdef -z2	4.08	2.398
advdef -z3	18.85	1.841
advdef -z4	69.97	2.423
advpng -z2	3.31	0.000
advpng -z3	11.92	0.000
advpng -z4	48.04	0.000
ect -1	7.83	2.644
ect -3	16.25	2.689
ect -3 (mt)	13.85	2.670
ect -5	23.85	2.736
ect -5 (mt)	18.32	2.736
ect -9	90.90	3.108
ect -9 (mt)	39.00	3.044
optipng -o2	27.47	2.790
optipng -o7	606.70	2.870
oxipng -ao2 (mt)	5.46	3.002
oxipng -ao6	48.28	3.049
oxipng -ao6 (mt)	11.85	3.049
oxipng -Zao6 (mt)	129.42	2.983
pingo -s0 -l	0.97	2.654
pingo -s1 -l	5.25	2.946
pingo -s2 -l	5.24	2.946
pingo -s3 -l	9.77	2.972
pingo -s3 -l (mt)	5.77	2.972
pingo -s4 -l	11.62	2.988
pingo -s4 -l (mt)	6.15	2.988
pngoptimizer (mt)	8.34	2.224
pngout	86.73	1.953
pngwolf	145.14	2.982
truepng -o1	27.38	2.857
truepng -o4	287.44	2.893
zopflipng	106.44	2.705

content-pics-grayscale - files

test	time (s)	saved (MB)
advdef -z2	1.43	0.392
advdef -z3	5.07	0.385
advdef -z4	17.39	0.399
advpng -z2	0.32	0.000
advpng -z3	0.29	0.000
advpng -z4	0.32	0.000
ect -1	3.46	2.674
ect -3	6.35	2.638
ect -3 (mt)	5.48	2.630
ect -5	10.20	2.653
ect -5 (mt)	8.50	2.653
ect -9	32.67	2.821
ect -9 (mt)	16.91	2.809
optipng -o2	10.91	2.763
optipng -o7	226.63	2.783
oxipng -ao2 (mt)	2.36	2.791
oxipng -ao6	20.73	2.801
oxipng -ao6 (mt)	5.02	2.801
oxipng -Zao6 (mt)	46.09	2.770
pingo -s0 -l	0.73	2.735
pingo -s1 -l	2.37	2.775
pingo -s2 -l	2.38	2.775
pingo -s3 -l	4.74	2.789
pingo -s3 -l (mt)	3.06	2.789
pingo -s4 -l	6.06	2.791
pingo -s4 -l (mt)	3.36	2.791
pngoptimizer (mt)	3.32	2.569
pngout	14.39	0.401
pngwolf	60.74	2.754
truepng -o1	22.87	2.756
truepng -o4	92.59	2.781
zopflipng	41.20	2.657

content-screenshots - files

test	time (s)	saved (MB)
advdef -z2	3.11	0.392
advdef -z3	10.51	0.384
advdef -z4	75.57	0.406
advpng -z2	2.93	0.388
advpng -z3	9.54	0.370
advpng -z4	74.15	0.400
ect -1	1.58	0.639
ect -3	4.30	0.783
ect -3 (mt)	2.95	0.782
ect -5	6.80	0.798
ect -5 (mt)	4.11	0.798
ect -9	49.38	0.814
ect -9 (mt)	19.10	0.814
optipng -o2	21.80	0.642
optipng -o7	233.67	0.646
oxipng -ao2 (mt)	2.62	0.771
oxipng -ao6	33.84	0.786
oxipng -ao6 (mt)	6.13	0.786
oxipng -Zao6 (mt)	106.78	0.788
pingo -s0 -l	1.97	0.704
pingo -s1 -l	2.17	0.751
pingo -s2 -l	3.32	0.760
pingo -s3 -l	7.32	0.789
pingo -s3 -l (mt)	3.94	0.789
pingo -s4 -l	9.22	0.792
pingo -s4 -l (mt)	4.32	0.792
pngoptimizer (mt)	6.35	0.638
pngout	153.71	0.381
pngwolf	106.19	0.791
truepng -o1	20.62	0.653
truepng -o4	147.47	0.670
zopflipng	80.96	0.772

content-sprites - files

test	time (s)	saved (MB)
advdef -z2	4.36	0.626
advdef -z3	15.64	0.619
advdef -z4	57.69	0.636
advpng -z2	4.37	0.783
advpng -z3	14.72	0.775
advpng -z4	56.57	0.791
ect -1	0.61	1.396
ect -3	2.16	1.443
ect -3 (mt)	1.59	1.443
ect -5	3.16	1.471
ect -5 (mt)	2.14	1.471
ect -9	19.03	1.474
ect -9 (mt)	7.25	1.473
optipng -o2	6.76	0.975
optipng -o7	74.21	1.084
oxipng -ao2 (mt)	1.59	1.463
oxipng -ao6	20.23	1.480
oxipng -ao6 (mt)	3.58	1.480
oxipng -Zao6 (mt)	27.11	1.481
pingo -s0 -l	0.80	1.371
pingo -s1 -l	1.61	1.457
pingo -s2 -l	2.28	1.465
pingo -s3 -l	3.59	1.479
pingo -s3 -l (mt)	2.26	1.479
pingo -s4 -l	5.05	1.481
pingo -s4 -l (mt)	2.70	1.481
pngoptimizer (mt)	3.85	1.265
pngout	84.98	0.610
pngwolf	62.30	1.241
truepng -o1	6.14	1.410
truepng -o4	40.14	1.420
zopflipng	21.19	1.458

content-text - files

test	time (s)	saved (MB)
advdef -z2	5.64	0.527
advdef -z3	16.09	0.516
advdef -z4	236.25	0.539
advpng -z2	3.77	0.591
advpng -z3	10.15	0.580
advpng -z4	225.02	0.601
ect -1	3.17	0.523
ect -3	4.56	0.611
ect -3 (mt)	4.11	0.611
ect -5	7.37	0.640
ect -5 (mt)	5.44	0.640
ect -9	58.06	0.646
ect -9 (mt)	40.86	0.648
optipng -o2	61.86	0.520
optipng -o7	352.05	0.521
oxipng -ao2 (mt)	4.04	0.649
oxipng -ao6	48.95	0.656
oxipng -ao6 (mt)	8.68	0.656
oxipng -Zao6 (mt)	367.24	0.664
pingo -s0 -l	2.43	0.523
pingo -s1 -l	3.26	0.609
pingo -s2 -l	4.69	0.622
pingo -s3 -l	8.51	0.659
pingo -s3 -l (mt)	5.85	0.659
pingo -s4 -l	11.45	0.663
pingo -s4 -l (mt)	7.62	0.663
pngoptimizer (mt)	17.42	0.524
pngout	196.55	0.537
pngwolf	347.33	0.541
truepng -o1	63.57	0.536
truepng -o4	319.64	0.548
zopflipng	255.72	0.647

ordered-transform-2 - files

test	time (s)	saved (MB)
advdef -z2	14.67	0.000
advdef -z3	40.66	0.000
advdef -z4	153.32	0.000
advpng -z2	10.66	0.018
advpng -z3	34.72	0.018
advpng -z4	136.14	0.023
ect -1	4.25	0.029
ect -3	16.03	0.709
ect -3 (mt)	11.17	0.699
ect -5	25.88	0.758
ect -5 (mt)	17.14	0.758
ect -9	150.88	0.814
ect -9 (mt)	64.69	0.813
optipng -o2	19.83	0.021
optipng -o7	347.18	0.021
oxipng -ao2 (mt)	7.92	0.708
oxipng -ao6	125.47	0.756
oxipng -ao6 (mt)	21.57	0.756
oxipng -Zao6 (mt)	223.41	0.822
pingo -s0 -l	5.62	0.558
pingo -s1 -l	5.74	0.660
pingo -s2 -l	10.32	0.743
pingo -s3 -l	22.09	0.822
pingo -s3 -l (mt)	12.81	0.822
pingo -s4 -l	30.85	0.883
pingo -s4 -l (mt)	16.28	0.883
pngoptimizer (mt)	6.82	0.415
pngout	474.35	0.013
pngwolf	251.58	0.056
truepng -o1	18.14	0.526
truepng -o4	198.46	0.604
zopflipng	169.60	0.056

ordered-transform-4 - files

test	time (s)	saved (MB)
advdef -z2	5.13	0.000
advdef -z3	16.19	0.000
advdef -z4	73.27	0.000
advpng -z2	1.68	0.000
advpng -z3	1.68	0.000
advpng -z4	1.74	0.000
ect -1	2.52	12.208
ect -3	7.60	11.606
ect -3 (mt)	6.41	11.601
ect -5	10.95	11.612
ect -5 (mt)	8.84	11.612
ect -9	52.86	11.655
ect -9 (mt)	24.96	11.655
optipng -o2	21.89	0.000
optipng -o7	443.22	0.001
oxipng -ao2 (mt)	4.47	12.262
oxipng -ao6	62.12	12.301
oxipng -ao6 (mt)	11.51	12.301
oxipng -Zao6 (mt)	74.40	12.319
pingo -s0 -l	2.60	12.028
pingo -s1 -l	5.20	12.210
pingo -s2 -l	7.83	12.245
pingo -s3 -l	12.35	12.292
pingo -s3 -l (mt)	9.47	12.292
pingo -s4 -l	16.63	12.306
pingo -s4 -l (mt)	10.54	12.306
pngoptimizer (mt)	9.43	0.000
pngout	124.74	0.000
pngwolf	139.00	0.011
truepng -o1	22.26	12.151
truepng -o4	155.74	12.213
zopflipng	78.50	11.655

ordered-transform-6 - files

test	time (s)	saved (MB)
advdef -z2	12.69	0.000
advdef -z3	41.37	0.000
advdef -z4	251.94	0.001
advpng -z2	11.30	0.054
advpng -z3	39.09	0.052
advpng -z4	264.85	0.058
ect -1	2.41	2.266
ect -3	7.82	1.478
ect -3 (mt)	7.04	1.476
ect -5	12.47	1.558
ect -5 (mt)	10.51	1.558
ect -9	53.44	1.674
ect -9 (mt)	25.48	1.674
optipng -o2	10.59	2.285
optipng -o7	114.21	2.289
oxipng -ao2 (mt)	4.52	2.313
oxipng -ao6	61.48	2.348
oxipng -ao6 (mt)	12.05	2.348
oxipng -Zao6 (mt)	77.14	2.368
pingo -s0 -l	2.48	2.076
pingo -s1 -l	5.05	2.264
pingo -s2 -l	7.72	2.297
pingo -s3 -l	12.19	2.346
pingo -s3 -l (mt)	9.44	2.346
pingo -s4 -l	17.06	2.354
pingo -s4 -l (mt)	10.24	2.354
pngoptimizer (mt)	10.21	0.023
pngout	101.84	1.643
pngwolf	224.95	0.093
truepng -o1	22.13	2.231
truepng -o4	147.97	2.272
zopflipng	78.52	1.669

reductions - files

test	time (s)	saved (MB)
advdef -z2	12.83	1.806
advdef -z3	41.22	1.785
advdef -z4	129.82	1.851
advpng -z2	11.23	1.793
advpng -z3	36.81	1.775
advpng -z4	123.72	1.837
ect -1	5.16	5.466
ect -3	12.86	5.838
ect -3 (mt)	9.13	5.827
ect -5	20.19	5.956
ect -5 (mt)	13.42	5.956
ect -9	283.20	6.422
ect -9 (mt)	156.40	6.122
optipng -o2	46.09	4.047
optipng -o7	696.05	4.161
oxipng -ao2 (mt)	9.29	6.475
oxipng -ao6	117.81	6.606
oxipng -ao6 (mt)	22.08	6.606
oxipng -Zao6 (mt)	292.48	6.531
pingo -s0 -l	4.48	6.100
pingo -s1 -l	9.34	6.410
pingo -s2 -l	13.25	6.534
pingo -s3 -l	22.43	6.585
pingo -s3 -l (mt)	13.75	6.585
pingo -s4 -l	31.36	6.644
pingo -s4 -l (mt)	15.87	6.644
pngoptimizer (mt)	21.97	5.090
pngout	445.00	1.792
pngwolf	264.02	5.346
truepng -o1	51.78	5.908
truepng -o4	535.14	6.394
zopflipng	222.73	6.030

sum (file per file, accumulated)

test	time (s)	saved (MB)
advdef -z2	182.81	16.13
advdef -z3	527.82	15.49
advdef -z4	2735.35	16.65
advpng -z2	153.18	17.31
advpng -z3	442.73	17.21
advpng -z4	2350.06	17.76
ect -1	74.99	56.53
ect -3	224.83	59.80
ect -3 (mt)	168.96	59.62
ect -5	345.91	60.43
ect -5 (mt)	242.99	60.43
ect -9	2179.18	62.18
ect -9 (mt)	1038.04	61.78
optipng -o2	511.09	39.88
optipng -o7	6699.84	40.60
oxipng -ao2 (mt)	139.04	64.76
oxipng -ao6	1881.36	66.11
oxipng -ao6 (mt)	344.37	66.11
oxipng -Zao6 (mt)	3722.44	66.45
pingo -s0 -l	84.00	58.96
pingo -s1 -l	128.35	63.85
pingo -s2 -l	187.83	64.95
pingo -s3 -l	335.94	65.92
pingo -s3 -l (mt)	214.99	65.92
pingo -s4 -l	456.69	66.59
pingo -s4 -l (mt)	254.39	66.59
pngoptimizer (mt)	214.45	42.48
pngout	7010.32	19.69
pngwolf	4074.09	44.51
truepng -o1	603.96	60.80
truepng -o4	5320.69	62.18
zopflipng	2960.95	59.67

file based mt (log)

test	time (s)	saved (MB)
ect -1	8.55	56.34
ect -3 (mt)	31.49	58.27
ect -5 (mt)	48.49	58.79
ect -9 (mt)	288.35	61.81
oxipng -ao2 (mt)	19.95	64.80
oxipng -ao6 (mt)	228.16	66.13
oxipng -Zao6 (mt)	613.09	66.48
pingo -s0 -l	7.81	58.92
pingo -s1 -l	14.65	63.87
pingo -s2 -l	23.29	64.97
pingo -s3 -l (mt)	46.21	65.94
pingo -s4 -l (mt)	62.19	66.61