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Compress an image to 35 KB
To get an image under 35 KB, PixelFit aims at 35,000 bytes or less, so forms counting 1 KB as 1000 or 1024 bytes both accept it. Estimated from our measured encodes, that is about 426 × 319 pixels for a 4:3 photo at quality 75, or 445 × 555 for a portrait.
Under 35 KB
JPG · under 35 KB (at most 35,000 bytes) · original pixel size · white background
PixelFit aims at 35,000 bytes or less, so the file passes whether the form counts 1 KB as 1,000 or 1,024 bytes.
Fit, background and padding white background
Saving presets is part of Pro.
The result appears here: the exact byte count, pixel size and quality, the size before and after, a preview and a download button.
The batch kit (one ZIP for up to 500 photos, several photos merged into one PDF) is part of Pro.
What 35 KB means in bytes
35 KB is 35,840 bytes when 1 KB = 1024 bytes (35 × 1024) and 35,000 bytes when a server counts 1 KB = 1000 bytes. The 840-byte gap matters only near the limit. PixelFit aims at 35,000 bytes or less and prints the exact byte count, so you can compare it with the form.
35 KB is 0.034 MB; 292 such files fit in 10 MB. Uncompressed, the 426 × 319 photo that fits here would need 398 KB of raw pixels, so JPEG at quality 75 packs it about 12 to 1.
Largest pixel size that fits 35 KB
The biggest image of each kind, in its own aspect ratio, that stays at or below 35,000 bytes.
| Image | JPG q60 | JPG q75 | JPG q90 | WebP q75 |
|---|---|---|---|---|
| Head-and-shoulders portrait | 526 × 656 | 445 × 555 | 322 × 402 | 655 × 818 |
| Outdoor landscape (12 MP phone photo) | 494 × 370 | 426 × 319 | 329 × 246 | 453 × 339 |
| Scanned typed document page | 463 × 581 | 400 × 502 | 308 × 387 | 479 × 601 |
| Handwritten letter with signature | 897 × 737 | 740 × 608 | 511 × 420 | 1,169 × 961 |
| Flat-colour graphic (flag) | 1,413 × 989 | 1,202 × 841 | 885 × 619 | 2,031 × 1,421 |
A 12 MP phone photo at 35 KB
Our 12 MP landscape sample (4032 × 3024) is about 4.15 MB at quality 90, 124 times the 35 KB budget; even quality 30 leaves 1.26 MB (extrapolated from encodes up to 3,000 px). So the pixels must go down too.
At about quality 75 it fits 35 KB near 426 × 319 (0.14 MP, 1 % of the original pixels). Quality 60 allows 494 × 370; quality 90 needs 329 × 246.
JPEG quality for fixed pixel sizes under 35 KB
When a form fixes the pixels, only quality can move. Highest quality (of 100) that keeps each size at or under 35,000 bytes:
| Pixel size | Measured on | JPG | WebP |
|---|---|---|---|
| 200 × 230 (small ID photo) | portrait photo | quality 95+ (21.9 KB) | quality 95+ (17.4 KB) |
| 413 × 531 (35 × 45 mm at 300 DPI) | portrait photo | quality 78 (33.7 KB) | quality 88 (33.1 KB) |
| 600 × 600 (2 × 2 inch at 300 DPI) | portrait photo | quality 57 (33.9 KB) | quality 81 (33.4 KB) |
| 800 × 600 (4:3 web photo) | landscape photo | no: fewer pixels needed | no: fewer pixels needed |
| 1200 × 1600 (3:4 portrait upload) | portrait photo | no: fewer pixels needed | no: fewer pixels needed |
| 1240 × 1754 (A4 page at 150 DPI) | scanned typed page | no: fewer pixels needed | no: fewer pixels needed |
Measured JPEG files either side of 35 KB
Real encodes from our test set at quality 75: the largest file that stays under 35,000 bytes and the smallest that goes over.
| Image | Largest under 35 KB | Smallest over 35 KB |
|---|---|---|
| Head-and-shoulders portrait | 400 × 500: 29,830 B | 480 × 600: 39,317 B |
| Outdoor landscape (12 MP phone photo) | 400 × 300: 30,893 B | 500 × 375: 48,064 B |
| Scanned typed document page | 398 × 500: 34,663 B | 477 × 600: 48,445 B |
| Handwritten letter with signature | 600 × 493: 24,480 B | 800 × 658: 39,979 B |
| Flat-colour graphic (flag) | 1200 × 840: 34,937 B | 1600 × 1120: 49,963 B |
JPG, WebP or PNG at 35 KB
At quality 75, WebP holds 453 × 339 of the landscape photo in 35 KB, JPG 426 × 319: 13 % more pixels. Portrait gain: 117 %. Typed page gain: 43 %. A moderate gain for the landscape photo at 35 KB, a large one for portraits: where WebP is accepted, use it for those. Many portals accept only JPG/JPEG, so this page starts in JPG.
A full-colour PNG is lossless, so its size follows the content. In 35 KB it holds a flat graphic of 774 × 541 pixels but a photo of only 151 × 113, against 426 × 319 as a quality-75 JPG. Reducing a PNG to a palette of up to 256 colours (PixelFit does this when a PNG must shrink) helps graphics far more than photos.
Which uploads fit comfortably in 35 KB
2 of the 6 sizes above keep quality 75 or better under 35 KB (200 × 230, 413 × 531); 3 miss even at quality 30 (800 × 600, 1200 × 1600, 1240 × 1754). At 426 × 319, quality 90 costs 64 % more bytes than quality 75.
A typed page reaches 463 × 581 at quality 60 in 35 KB, about 50 DPI if it is an A4 sheet.
How to compress an image to 35 KB
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Open the tool above
It is preset to 35 KB (35,000 bytes or less), JPG output.
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Add your image
Drop, paste or pick it; a PNG, WebP or (where the browser opens it) HEIC file becomes a JPG under 35 KB.
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Pixel size: only if asked
On auto, a typical photo stops near 426 × 319 at about quality 75.
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Download and check
name-35kb.jpg comes with its byte count, pixels and quality.
Sources
- Measured by PixelFit with sharp 0.35.5 / libvips 8.18.7 on 31 October 2026.
- Sample images, Wikimedia Commons, checked 31 October 2026: landscape (CC0 1.0) commons.wikimedia.org/w/index.php?curid=154070378; portrait commons.wikimedia.org/w/index.php?curid=23956389; typed page commons.wikimedia.org/w/index.php?curid=194775753; handwritten letter commons.wikimedia.org/w/index.php?curid=90423615; flag commons.wikimedia.org/w/index.php?curid=361734 (public domain).
- Binary prefixes, NIST, checked 31 October 2026: physics.nist.gov/cuu/Units/binary.html
Frequently asked questions
How do I compress an image to 35 KB?
Drop it into the tool here, preset to 35 KB. It searches JPEG quality (at most 8 encodes per pixel size), then scales pixels down if needed, until the file is 35,000 bytes or less. A 4:3 photo typically lands near 426 × 319 at about quality 75.
How do I compress an image to less than 35 KB without losing quality?
Give up pixels before quality: at quality 75, 35 KB holds 426 × 319 of a photo and 445 × 555 of a portrait; quality 90 at 426 × 319 costs 64 % more bytes.
Is 35 KB 35,000 or 35,840 bytes?
Both readings exist: 35,840 bytes (1 KB = 1024) or 35,000 bytes (1 KB = 1000). 35,000 bytes or less passes both.
Can I compress a PNG to 35 KB?
Yes, but a full-colour PNG photo stays big: about 151 × 113 pixels in 35 KB, versus 774 × 541 for a flat graphic. As a JPG the photo reaches 426 × 319.
What pixel size fits 35 KB?
At quality 75: a photo 426 × 319, a portrait 445 × 555, a typed page 400 × 502.
Related
Nearby file sizes
- Compress to 30 KB photo ≈ 394 × 295
- Compress to 25 KB photo ≈ 357 × 267
- Compress to 20 KB photo ≈ 317 × 237
- Compress to 40 KB photo ≈ 455 × 341
- Compress to 45 KB photo ≈ 483 × 362
- Compress to 50 KB photo ≈ 510 × 382
More ways to hit 35 KB
- Image resizer with KB target Any size, pixels and format
Pixel sizes that fit 35 KB
- 25×35 mm photo about 30.6 KB as a quality-75 JPG
- 400×300 landscape about 30.2 KB as a quality-75 JPG
- 300×400 portrait about 30.2 KB as a quality-75 JPG
- 160×600 banner about 24.5 KB as a quality-75 JPG