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JPG to PDF under 300 KB
To make a PDF under 300 KB, PixelFit compresses the JPG to at most 299,262 bytes and wraps it in a one-page PDF with about 738 bytes of PDF structure, 300,000 bytes or less in total. Measured: an A4 scan at 150 DPI fits at quality 80; a 4:3 photo at about 1,230 × 922 pixels (quality 75).
PDF under 300 KB
PDF · under 300 KB (at most 300,000 bytes) · original pixel size · white background
PixelFit aims at 300,000 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 · page the size of the picture
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.
Where the 300 KB go in a JPG-to-PDF file
Of the 300,000 bytes that pass as 300 KB under both KB definitions, PDF structure takes 738 bytes for one A4 page (computed with PixelFit's own writer), leaving 299,262 bytes, 99.7 %, for the JPEG; ten pages leave 29,475 bytes each.
For one photo, quality 75 allows 1,230 × 922 pixels and quality 90 977 × 732; a full 12 MP frame must be scaled down first, which the tool does for you.
How many pages fit in a 300 KB PDF
The 300,000 bytes of 300 KB, less 738 bytes of PDF structure for the first page and about 501 for each extra one, shared evenly.
| Pages | JPEG bytes per page | Max A4 DPI at q50 | Max A4 DPI at q75 | A4 at 150 DPI |
|---|---|---|---|---|
| 1 page | 299,262 | 222 DPI | 165 DPI | quality 80 |
| 2 pages | 149,382 | 138 DPI | 105 DPI | quality 41 |
| 3 pages | 99,420 | 105 DPI | 81 DPI | no: 1.3× over at q30 |
| 5 pages | 59,452 | 76 DPI | 60 DPI | no: 2.1× over at q30 |
| 10 pages | 29,475 | 52 DPI | 41 DPI | no: 4.3× over at q30 |
| 20 pages | 14,486 | 36 DPI | 29 DPI | no: 8.6× over at q30 |
| 50 pages | 5,492 | 22 DPI | 17 DPI | no: 22.8× over at q30 |
Phone photos in one PDF under 300 KB
Largest 4:3 photo per page, in pixels, when 1 to 10 photos share 300,000 bytes; "full" means a 12 MP phone photo keeps all its pixels (the tool never enlarges).
| Photos | Quality 60 | Quality 75 | Quality 90 |
|---|---|---|---|
| 1 photo | 1,423 × 1,067 | 1,230 × 922 | 977 × 732 |
| 2 photos | 1,013 × 759 | 878 × 658 | 687 × 515 |
| 3 photos | 828 × 621 | 715 × 536 | 560 × 420 |
| 5 photos | 640 × 480 | 554 × 415 | 433 × 324 |
| 10 photos | 453 × 339 | 390 × 292 | 300 × 225 |
A4 and Letter pixel sizes against 300 KB
One typed page per DPI: its pixels, the quality it gets alone in 300 KB, and how many fit at quality 75.
| DPI | A4 pixels | One A4 page under 300 KB | Letter page | Pages at q75 |
|---|---|---|---|---|
| 72 DPI | 595 × 842 | quality 95+ | quality 95+ | 3 |
| 100 DPI | 827 × 1169 | quality 93 | quality 94 | 2 |
| 150 DPI | 1240 × 1754 | quality 80 | quality 80 | 1 |
| 200 DPI | 1654 × 2339 | quality 60 | quality 61 | none |
| 300 DPI | 2480 × 3508 | no: 1.1× over at q30 | no: 1.1× over at q30 | none |
Readable pages and photos in 300 KB
At 300 KB, 1 typed A4 page at 150 DPI fits at quality 50 or better (1 at 200 DPI), but not one photo of 1600 × 1200 at quality 70.
One page alone gets quality 80 at 150 DPI and quality 60 at 200 DPI; at 300 DPI even quality 30 is 1.1 times too big.
One image free, several merged with Pro
Free: each image becomes its own one-page PDF under 300 KB. Pro: several images merged into one PDF under 300 KB, on your device; 5 pages get 59,452 bytes of JPEG each.
How to turn a JPG into a PDF under 300 KB
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Open the tool above
Preset: PDF output, at most 300 KB.
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Add the JPG
Drop, paste or pick it (PNG, WebP and HEIC work too).
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Choose the page
Keep the picture's own size or fit it on A4 or Letter.
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Download
name-300kb.pdf arrives with its exact byte count (300,000 bytes or less).
Forms with a 300 KB PDF limit
Upload specs in our dataset with a PDF limit of exactly 300 KB. Verify with the official notice before you submit.
300 KB PDF uploads
Sources
- Measured by PixelFit with sharp 0.35.5 / libvips 8.18.7 on 31 October 2026.
- Samples, Wikimedia Commons, checked 31 October 2026: typed page (public domain) commons.wikimedia.org/w/index.php?curid=194775753; landscape (CC0 1.0) commons.wikimedia.org/w/index.php?curid=154070378
- Paper sizes, Markus Kuhn, checked 31 October 2026: cl.cam.ac.uk/~mgk25/iso-paper.html
- PDF format, Library of Congress, checked 31 October 2026: loc.gov/preservation/digital/formats/fdd/fdd000474.shtml
Frequently asked questions
How do I convert a JPG to PDF under 300 KB?
Drop the JPG into the tool on this page, preset to PDF under 300 KB: the picture is compressed to 299,262 bytes or less, so the PDF ends at or below 300,000 bytes.
Can I convert JPG to PDF for free?
Yes, one image per PDF, with no upload. Under 300 KB a 4:3 photo keeps 1,230 × 922 pixels at quality 75; merging several JPGs is Pro.
How many pages fit in a 300 KB PDF?
About 1 typed A4 page scanned at 150 DPI at quality 50 or better, or 1 at 200 DPI; not one photo of 1600 × 1200 at quality 70.
What DPI should a scan have for a 300 KB PDF?
For one typed A4 page, at most 222 DPI at quality 50, or 165 DPI at quality 75, under 300 KB; of the usual 72 to 300 DPI settings, 200 DPI.
Why is the PDF bigger than my JPG?
A PDF wraps the JPEG in page, image and cross-reference objects: 738 bytes for one page in PixelFit's writer, about 501 more per added page.
Related
Other PDF size limits
- JPG to PDF under 250 KB 1 A4 page at 150 DPI
- JPG to PDF under 200 KB 1 A4 page at 150 DPI
- JPG to PDF under 150 KB one cropped image
- JPG to PDF under 400 KB 2 A4 pages at 150 DPI
- JPG to PDF under 500 KB 2 A4 pages at 150 DPI
- JPG to PDF under 600 KB 3 A4 pages at 150 DPI
More for 300 KB
- Compress an image to 300 KB Same limit, image output
- JPG to PDF: what changes Format facts
- Image resizer with KB target Any size and format
Other formats to PDF
Pixel sizes that fit 300 KB
- 1200×900 landscape about 278 KB as a quality-75 JPG
- 900×1200 portrait about 278 KB as a quality-75 JPG
- 1366×768 (WXGA) about 270 KB as a quality-75 JPG