How to make a PDF under 40 KB from JPG files
- Choose images. Tap Choose images and select one or more pictures. They go into the PDF in the order shown; use the arrows to reorder.
- Check the options. Page size A4 with a small margin is the default. The 40 KB maximum is already filled in.
- Press Convert to PDF. If the first PDF is too big, pictures are scaled down and re-encoded as JPEG, step by step, until the PDF fits.
- Download and check. The result line shows the final size next to the 40 KB limit. Open the PDF and make sure small print is still legible.
How many JPG files fit in 40 KB?
A phone photo is often 3 to 4 MB. To fit 40 KB, each picture has to lose pixels as well as JPEG quality. As a rule of thumb from our tests, a document photo stays readable at about 25 to 40 KB, so 40 KB holds around 1 readable pictures.
| Pictures | Budget per picture | Readability |
|---|---|---|
| 1 | 40 KB | Readable |
| 2 | 20 KB | Too small to stay readable |
| 3 | 13 KB | Too small to stay readable |
| 5 | 8 KB | Too small to stay readable |
| 10 | 4 KB | Too small to stay readable |
About JPG files
JPG (also written JPEG) is the usual format for phone photos and scans. It uses lossy compression, which is why a photo can shrink a lot before the eye notices.
What we measured
Real results from our engine on 2026-10-17 with 12-megapixel phone photos:
| Pictures | Original | Target | Result |
|---|---|---|---|
| 1 phone photo | 3,687 KB | 50 KB | 42 KB |
| 1 phone photo | 3,687 KB | 100 KB | 42 KB |
| 1 phone photo | 3,687 KB | 200 KB | 110 KB |
| 2 phone photos | 7,375 KB | 50 KB | 36 KB |
| 2 phone photos | 7,375 KB | 100 KB | 83 KB |
| 2 phone photos | 7,375 KB | 200 KB | 83 KB |
| 3 phone photos | 11,062 KB | 50 KB | 36 KB |
| 3 phone photos | 11,062 KB | 100 KB | 54 KB |
| 3 phone photos | 11,062 KB | 200 KB | 124 KB |
Tips for small PDFs
- Crop the photo to the document edges before converting; empty table or floor costs bytes.
- Shoot in good light; noise from dark photos takes more space after compression.
- Use one picture per page and remove duplicates.
- If the form allows, send the front and back as two separate files.
Is it safe to compress a private PDF here?
Yes. The page reads your file with the browser's File API and does all the work in JavaScript on your device. When the job finishes, the page shows how many bytes were uploaded: zero. Nothing is stored, so there is nothing to delete afterwards.
Other limits and formats
The same tool with other presets. See every variant on the image to PDF sizes page.
Frequently asked questions
How do I convert JPG files to a PDF under 40 KB?
Choose your pictures on this page and press Convert to PDF. The 40 KB limit is preset; the tool shrinks the pictures until the PDF fits.
Will the quality drop?
Only as much as needed to fit 40 KB. The tool starts with mild settings and stops at the first step that fits.
Can I put several JPG files in one PDF?
Yes. Add as many as you like; each becomes a page, in the order shown.
Does it accept iPhone HEIC photos?
Not yet. Share or export the photo as JPG first, then add it here.
Is anything uploaded?
No. The conversion runs in your browser and the result shows 0 bytes uploaded.
Is ilovepdfe the same as iLovePDF?
No. ilovepdfe is an independent site and is not affiliated with iLovePDF. It processes files in your browser instead of uploading them.
JPG to PDF
JPG to PDF converter: photos to one PDF, on your device — Turn photos and scans (JPG, PNG, WebP) into one PDF.
Sources
- File API (MDN) — MDN
- PDF format family (Library of Congress) — Library of Congress
- JPEG (Wikipedia) — Wikipedia