Updated · how we check
JPG to PDF under 600 KB
To make a PDF under 600 KB, PixelFit compresses the JPG to at most 599,262 bytes and wraps it in a one-page PDF with about 738 bytes of PDF structure, 600,000 bytes or less in total. Measured: an A4 scan at 150 DPI fits at quality 93; a 4:3 photo at about 1,762 × 1,321 pixels (quality 75).
PDF under 600 KB
PDF · under 600 KB (at most 600,000 bytes) · original pixel size · white background
PixelFit aims at 600,000 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 600 KB go in a JPG-to-PDF file
Of the 600,000 bytes that pass as 600 KB under both KB definitions, PDF structure takes 738 bytes for one A4 page (computed with PixelFit's own writer), leaving 599,262 bytes, 99.8 %, for the JPEG; ten pages leave 59,475 bytes each.
For one photo, quality 75 allows 1,762 × 1,321 pixels and quality 90 1,382 × 1,036; a full 12 MP frame must be scaled down first, which the tool does for you.
How many pages fit in a 600 KB PDF
The 600,000 bytes of 600 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 | 599,262 | 349 DPI* | 254 DPI | quality 93 |
| 2 pages | 299,382 | 222 DPI | 165 DPI | quality 80 |
| 3 pages | 199,420 | 168 DPI | 126 DPI | quality 61 |
| 5 pages | 119,451 | 118 DPI | 91 DPI | no: 1.0× over at q30 |
| 10 pages | 59,475 | 77 DPI | 60 DPI | no: 2.1× over at q30 |
| 20 pages | 29,486 | 52 DPI | 41 DPI | no: 4.2× over at q30 |
| 50 pages | 11,491 | 32 DPI | 25 DPI | no: 10.9× over at q30 |
| 100 pages | 5,492 | 22 DPI | 17 DPI | no: 22.8× over at q30 |
Phone photos in one PDF under 600 KB
Largest 4:3 photo per page, in pixels, when 1 to 10 photos share 600,000 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 | 2,038 × 1,528 | 1,762 × 1,321 | 1,382 × 1,036 |
| 2 photos | 1,423 × 1,067 | 1,231 × 923 | 978 × 733 |
| 3 photos | 1,160 × 870 | 1,014 × 760 | 797 × 597 |
| 5 photos | 907 × 680 | 785 × 588 | 614 × 460 |
| 10 photos | 640 × 480 | 554 × 415 | 434 × 325 |
A4 and Letter pixel sizes against 600 KB
One typed page per DPI: its pixels, the quality it gets alone in 600 KB, and how many fit at quality 75.
| DPI | A4 pixels | One A4 page under 600 KB | Letter page | Pages at q75 |
|---|---|---|---|---|
| 72 DPI | 595 × 842 | quality 95+ | quality 95+ | 7 |
| 100 DPI | 827 × 1169 | quality 95+ | quality 95+ | 4 |
| 150 DPI | 1240 × 1754 | quality 93 | quality 94 | 2 |
| 200 DPI | 1654 × 2339 | quality 85 | quality 86 | 1 |
| 300 DPI | 2480 × 3508 | quality 63 | quality 64 | none |
Readable pages and photos in 600 KB
At 600 KB, 3 typed A4 pages at 150 DPI fit at quality 50 or better (2 at 200 DPI), and so does 1 photo of 1600 × 1200 at quality 70.
One page alone gets quality 93 at 150 DPI, quality 85 at 200 DPI and quality 63 at 300 DPI.
One image free, several merged with Pro
Free: each image becomes its own one-page PDF under 600 KB. Pro: several images merged into one PDF under 600 KB, on your device; 5 pages get 119,451 bytes of JPEG each.
How to turn a JPG into a PDF under 600 KB
-
Open the tool above
Preset: PDF output, at most 600 KB.
-
Add the JPG
Drop, paste or pick it (PNG, WebP and HEIC work too).
-
Choose the page
Keep the picture's own size or fit it on A4 or Letter.
-
Download
name-600kb.pdf arrives with its exact byte count (600,000 bytes or less).
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 600 KB?
Drop the JPG into the tool on this page, preset to PDF under 600 KB: the picture is compressed to 599,262 bytes or less, so the PDF ends at or below 600,000 bytes.
Can I convert JPG to PDF for free?
Yes, one image per PDF, with no upload. Under 600 KB a 4:3 photo keeps 1,762 × 1,321 pixels at quality 75; merging several JPGs is Pro.
How many pages fit in a 600 KB PDF?
About 3 typed A4 pages scanned at 150 DPI at quality 50 or better, or 2 at 200 DPI; 1 photo of 1600 × 1200 at quality 70.
What DPI should a scan have for a 600 KB PDF?
For one typed A4 page, at most 349 DPI (extrapolated) at quality 50, or 254 DPI at quality 75, under 600 KB; of the usual 72 to 300 DPI settings, 300 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 500 KB 2 A4 pages at 150 DPI
- JPG to PDF under 400 KB 2 A4 pages at 150 DPI
- JPG to PDF under 300 KB 1 A4 page at 150 DPI
- JPG to PDF under 700 KB 4 A4 pages at 150 DPI
- JPG to PDF under 800 KB 4 A4 pages at 150 DPI
- JPG to PDF under 1 MB 5 A4 pages at 150 DPI
More for 600 KB
- Compress an image to 600 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 600 KB
- 1920×1200 (WUXGA) about 579 KB as a quality-75 JPG
- 1500×1500 square about 566 KB as a quality-75 JPG
- 2048×1080 (DCI 2K) about 557 KB as a quality-75 JPG