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Compress an image to 150 KB
To get an image under 150 KB, PixelFit aims at 150,000 bytes or less, so forms counting 1 KB as 1000 or 1024 bytes both accept it. Estimated from our measured encodes, that is about 879 × 659 pixels for a 4:3 photo at quality 75, or 1,135 × 1,417 for a portrait.
Under 150 KB
JPG · under 150 KB (at most 150,000 bytes) · original pixel size · white background
PixelFit aims at 150,000 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 150 KB means in bytes
150 KB is 153,600 bytes when 1 KB = 1024 bytes (150 × 1024) and 150,000 bytes when a server counts 1 KB = 1000 bytes. The 3,600-byte gap matters only near the limit. PixelFit aims at 150,000 bytes or less and prints the exact byte count, so you can compare it with the form.
150 KB is 0.15 MB; 68 such files fit in 10 MB. Uncompressed, the 879 × 659 photo that fits here would need 1.66 MB of raw pixels, so JPEG at quality 75 packs it about 12 to 1.
Largest pixel size that fits 150 KB
The biggest image of each kind, in its own aspect ratio, that stays at or below 150,000 bytes.
| Image | JPG q60 | JPG q75 | JPG q90 | WebP q75 |
|---|---|---|---|---|
| Head-and-shoulders portrait | 1,376 × 1,718 | 1,135 × 1,417 | 805 × 1,005 | 1,765 × 2,204 |
| Outdoor landscape (12 MP phone photo) | 1,015 × 761 | 879 × 659 | 689 × 516 | 938 × 703 |
| Scanned typed document page | 1,110 × 1,394 | 925 × 1,162 | 676 × 849 | 1,316 × 1,653 |
| Handwritten letter with signature | 2,073 × 1,704 | 1,691 × 1,390 | 1,136 × 933 | 2,658 × 2,185 |
| Flat-colour graphic (flag) | 4,084 × 2,858* | 3,652 × 2,556* | 2,824 × 1,976 | 6,999 × 4,899* |
A 12 MP phone photo at 150 KB
Our 12 MP landscape sample (4032 × 3024) is about 4.15 MB at quality 90, 29 times the 150 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 150 KB near 879 × 659 (0.58 MP, 5 % of the original pixels). Quality 60 allows 1,015 × 761; quality 90 needs 689 × 516.
JPEG quality for fixed pixel sizes under 150 KB
When a form fixes the pixels, only quality can move. Highest quality (of 100) that keeps each size at or under 150,000 bytes:
| Pixel size | Measured on | JPG | WebP |
|---|---|---|---|
| 600 × 600 (2 × 2 inch at 300 DPI) | portrait photo | quality 95+ (108 KB) | quality 95+ (80.5 KB) |
| 800 × 600 (4:3 web photo) | landscape photo | quality 81 (143 KB) | quality 84 (144 KB) |
| 1080 × 1080 (square social post) | landscape photo | quality 33 (145 KB) | no: fewer pixels needed |
| 1200 × 1600 (3:4 portrait upload) | portrait photo | quality 68 (146 KB) | quality 86 (145 KB) |
| 1920 × 1080 (Full HD frame) | landscape photo | no: fewer pixels needed | no: fewer pixels needed |
| 1240 × 1754 (A4 page at 150 DPI) | scanned typed page | quality 41 (145 KB) | quality 75 (146 KB) |
Measured JPEG files either side of 150 KB
Real encodes from our test set at quality 75: the largest file that stays under 150,000 bytes and the smallest that goes over.
| Image | Largest under 150 KB | Smallest over 150 KB |
|---|---|---|
| Head-and-shoulders portrait | 961 × 1200: 113,785 B | 1281 × 1600: 183,340 B |
| Outdoor landscape (12 MP phone photo) | 800 × 600: 124,163 B | 1000 × 750: 193,683 B |
| Scanned typed document page | 796 × 1000: 117,818 B | 955 × 1200: 157,822 B |
| Handwritten letter with signature | 1600 × 1315: 134,065 B | 2000 × 1644: 210,628 B |
| Flat-colour graphic (flag) | 3000 × 2100: 115,604 B | none: every measured size fits |
JPG, WebP or PNG at 150 KB
At quality 75, WebP holds 938 × 703 of the landscape photo in 150 KB, JPG 879 × 659: 14 % more pixels. Portrait gain: 142 %. Typed page gain: 102 %. A moderate gain for the landscape photo at 150 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 150 KB it holds a flat graphic of 2,837 × 1,985 pixels but a photo of only 317 × 237, against 879 × 659 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 150 KB
2 of the 6 sizes above keep quality 75 or better under 150 KB (600 × 600, 800 × 600); 1 misses even at quality 30 (1920 × 1080). At 879 × 659, quality 90 costs 62 % more bytes than quality 75.
A typed page reaches 1,110 × 1,394 at quality 60 in 150 KB, about 119 DPI if it is an A4 sheet.
How to compress an image to 150 KB
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Open the tool above
It is preset to 150 KB (150,000 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 150 KB.
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Pixel size: only if asked
On auto, a typical photo stops near 879 × 659 at about quality 75.
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Download and check
name-150kb.jpg comes with its byte count, pixels and quality.
Forms that ask for 150 KB
Upload specs in our dataset with exactly 150 KB. Verify with the official notice before you submit.
150 KB limits
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 150 KB?
Drop it into the tool here, preset to 150 KB. It searches JPEG quality (at most 8 encodes per pixel size), then scales pixels down if needed, until the file is 150,000 bytes or less. A 4:3 photo typically lands near 879 × 659 at about quality 75.
How do I compress an image to less than 150 KB without losing quality?
Give up pixels before quality: at quality 75, 150 KB holds 879 × 659 of a photo and 1,135 × 1,417 of a portrait; quality 90 at 879 × 659 costs 62 % more bytes.
Is 150 KB 150,000 or 153,600 bytes?
Both readings exist: 153,600 bytes (1 KB = 1024) or 150,000 bytes (1 KB = 1000). 150,000 bytes or less passes both.
Can I compress a PNG to 150 KB?
Yes, but a full-colour PNG photo stays big: about 317 × 237 pixels in 150 KB, versus 2,837 × 1,985 for a flat graphic. As a JPG the photo reaches 879 × 659.
What pixel size fits 150 KB?
At quality 75: a photo 879 × 659, a portrait 1,135 × 1,417, a typed page 925 × 1,162.
Related
Nearby file sizes
- Compress to 120 KB photo ≈ 786 × 589
- Compress to 100 KB photo ≈ 717 × 537
- Compress to 90 KB photo ≈ 681 × 510
- Compress to 200 KB photo ≈ 1,015 × 761
- Compress to 240 KB photo ≈ 1,106 × 829
- Compress to 250 KB photo ≈ 1,128 × 846
More ways to hit 150 KB
- JPG to PDF under 150 KB One image as a PDF
- Image resizer with KB target Any size, pixels and format
Pixel sizes that fit 150 KB
- 2×3 inch print about 136 KB as a quality-75 JPG
- 900×600 landscape about 136 KB as a quality-75 JPG
- 960×540 (qHD) about 131 KB as a quality-75 JPG
- 630×810 px photo about 129 KB as a quality-75 JPG