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Compress an image to 70 KB
To get an image under 70 KB, PixelFit aims at 70,000 bytes or less, so forms counting 1 KB as 1000 or 1024 bytes both accept it. Estimated from our measured encodes, that is about 600 × 450 pixels for a 4:3 photo at quality 75, or 701 × 875 for a portrait.
Under 70 KB
JPG · under 70 KB (at most 70,000 bytes) · original pixel size · white background
PixelFit aims at 70,000 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 70 KB means in bytes
70 KB is 71,680 bytes when 1 KB = 1024 bytes (70 × 1024) and 70,000 bytes when a server counts 1 KB = 1000 bytes. The 1,680-byte gap matters only near the limit. PixelFit aims at 70,000 bytes or less and prints the exact byte count, so you can compare it with the form.
70 KB is 0.068 MB; 146 such files fit in 10 MB. Uncompressed, the 600 × 450 photo that fits here would need 791 KB of raw pixels, so JPEG at quality 75 packs it about 12 to 1.
Largest pixel size that fits 70 KB
The biggest image of each kind, in its own aspect ratio, that stays at or below 70,000 bytes.
| Image | JPG q60 | JPG q75 | JPG q90 | WebP q75 |
|---|---|---|---|---|
| Head-and-shoulders portrait | 837 × 1,045 | 701 × 875 | 505 × 630 | 1,095 × 1,367 |
| Outdoor landscape (12 MP phone photo) | 694 × 520 | 600 × 450 | 470 × 352 | 638 × 478 |
| Scanned typed document page | 686 × 862 | 584 × 733 | 444 × 557 | 752 × 944 |
| Handwritten letter with signature | 1,370 × 1,126 | 1,104 × 907 | 752 × 618 | 1,756 × 1,443 |
| Flat-colour graphic (flag) | 2,354 × 1,647 | 2,058 × 1,440 | 1,543 × 1,080 | 3,668 × 2,567* |
A 12 MP phone photo at 70 KB
Our 12 MP landscape sample (4032 × 3024) is about 4.15 MB at quality 90, 62 times the 70 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 70 KB near 600 × 450 (0.27 MP, 2 % of the original pixels). Quality 60 allows 694 × 520; quality 90 needs 470 × 352.
JPEG quality for fixed pixel sizes under 70 KB
When a form fixes the pixels, only quality can move. Highest quality (of 100) that keeps each size at or under 70,000 bytes:
| Pixel size | Measured on | JPG | WebP |
|---|---|---|---|
| 413 × 531 (35 × 45 mm at 300 DPI) | portrait photo | quality 94 (67.4 KB) | quality 95+ (54 KB) |
| 600 × 600 (2 × 2 inch at 300 DPI) | portrait photo | quality 87 (66 KB) | quality 93 (67.5 KB) |
| 800 × 600 (4:3 web photo) | landscape photo | quality 41 (67.5 KB) | quality 37 (67.9 KB) |
| 1080 × 1080 (square social post) | landscape photo | no: fewer pixels needed | no: fewer pixels needed |
| 1200 × 1600 (3:4 portrait upload) | portrait photo | no: fewer pixels needed | quality 60 (67.7 KB) |
| 1240 × 1754 (A4 page at 150 DPI) | scanned typed page | no: fewer pixels needed | no: fewer pixels needed |
Measured JPEG files either side of 70 KB
Real encodes from our test set at quality 75: the largest file that stays under 70,000 bytes and the smallest that goes over.
| Image | Largest under 70 KB | Smallest over 70 KB |
|---|---|---|
| Head-and-shoulders portrait | 641 × 800: 60,900 B | 801 × 1000: 85,857 B |
| Outdoor landscape (12 MP phone photo) | 600 × 450: 69,996 B | 800 × 600: 124,163 B |
| Scanned typed document page | 477 × 600: 48,445 B | 637 × 800: 81,646 B |
| Handwritten letter with signature | 1000 × 822: 59,731 B | 1200 × 987: 80,051 B |
| Flat-colour graphic (flag) | 2000 × 1400: 67,373 B | 2400 × 1680: 86,029 B |
JPG, WebP or PNG at 70 KB
At quality 75, WebP holds 638 × 478 of the landscape photo in 70 KB, JPG 600 × 450: 13 % more pixels. Portrait gain: 144 %. Typed page gain: 66 %. A moderate gain for the landscape photo at 70 KB, a large one for portraits and typed pages: 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 70 KB it holds a flat graphic of 1,438 × 1,006 pixels but a photo of only 215 × 161, against 600 × 450 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 70 KB
2 of the 6 sizes above keep quality 75 or better under 70 KB (413 × 531, 600 × 600); 3 miss even at quality 30 (1080 × 1080, 1200 × 1600, 1240 × 1754). At 600 × 450, quality 90 costs 63 % more bytes than quality 75.
A typed page reaches 686 × 862 at quality 60 in 70 KB, about 74 DPI if it is an A4 sheet.
How to compress an image to 70 KB
-
Open the tool above
It is preset to 70 KB (70,000 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 70 KB.
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Pixel size: only if asked
On auto, a typical photo stops near 600 × 450 at about quality 75.
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Download and check
name-70kb.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 70 KB?
Drop it into the tool here, preset to 70 KB. It searches JPEG quality (at most 8 encodes per pixel size), then scales pixels down if needed, until the file is 70,000 bytes or less. A 4:3 photo typically lands near 600 × 450 at about quality 75.
How do I compress an image to less than 70 KB without losing quality?
Give up pixels before quality: at quality 75, 70 KB holds 600 × 450 of a photo and 701 × 875 of a portrait; quality 90 at 600 × 450 costs 63 % more bytes.
Is 70 KB 70,000 or 71,680 bytes?
Both readings exist: 71,680 bytes (1 KB = 1024) or 70,000 bytes (1 KB = 1000). 70,000 bytes or less passes both.
Can I compress a PNG to 70 KB?
Yes, but a full-colour PNG photo stays big: about 215 × 161 pixels in 70 KB, versus 1,438 × 1,006 for a flat graphic. As a JPG the photo reaches 600 × 450.
What pixel size fits 70 KB?
At quality 75: a photo 600 × 450, a portrait 701 × 875, a typed page 584 × 733.
Related
Nearby file sizes
- Compress to 60 KB photo ≈ 557 × 417
- Compress to 50 KB photo ≈ 510 × 382
- Compress to 45 KB photo ≈ 483 × 362
- Compress to 75 KB photo ≈ 621 × 465
- Compress to 80 KB photo ≈ 641 × 480
- Compress to 90 KB photo ≈ 681 × 510
More ways to hit 70 KB
- Image resizer with KB target Any size, pixels and format
Pixel sizes that fit 70 KB
- 512×512 PWA icon about 66.3 KB as a quality-75 JPG
- 500×500 square about 63.1 KB as a quality-75 JPG
- 970×250 banner about 61.2 KB as a quality-75 JPG
- 600×400 landscape about 60.5 KB as a quality-75 JPG