Compress a PDF to reduce its file size by re-encoding every page as a JPEG image at a quality you set. That shrinks scanned and photo-heavy documents the most: a phone scan of a long form, or a brochure full of pictures, brought under an email or upload limit. In exchange, pages become pictures, so text can no longer be selected or searched, and links and fillable form fields do not carry over. The result line shows the size before and after, and the whole job runs on your device with nothing uploaded.
How it works
- Drop one PDF, or up to 100 to compress in one batch with the same setting.
- Set the quality slider anywhere from 30% to 90% (it starts at 60%): lower gives a smaller file and softer pages. Or tick “Target an exact size instead” and type a size in KB.
- Press Compress & download. Each page is rendered at 108 dpi and re-encoded; a batch arrives as one ZIP with a report on every file.
Questions
- Why did my PDF get bigger after compressing?
- Most likely because it was mostly typed text. Text is stored as compact character and font data, and a picture of the same page can take more room than that. This mode pays off on scans and image-heavy files. Compare the before and after sizes in the result line, and keep your original if compressing did not help.
- Will compressing make my PDF blurry?
- Somewhat, and the slider decides how much. Every page is redrawn at 108 dpi, a little above the 96 dpi of a typical screen, then saved as a JPEG at the quality you choose. Small print and fine lines soften first, and low quality adds blocky artefacts. If a page must stay crisp, move the slider toward 90% and check what that costs in size.
- Can I compress several PDFs at once?
- Yes. Drop up to 100 PDFs, 2 GB in total, and they are compressed one after another with the same setting. The download is a single ZIP holding each compressed file plus _report.txt and _report.json, which list every input and whether it succeeded.
- Does my file get uploaded?
- No. The models and all processing run inside your browser on your own device. You can verify this yourself: open your browser’s DevTools, watch the Network tab, and process a file: there are no uploads. After the first visit most tools also work fully offline.
- Is merge/split lossless?
- Yes. Merging, splitting, reordering and rotating copy pages intact: text stays selectable, links keep working, quality is untouched. Only the compress pages re-encode content, and they say so.
- How strong is the password protection?
- Without the password the file cannot be opened. The cipher follows the PDF’s own version: AES-128 for PDF 1.6 and 1.7, and the older RC4 cipher for other versions. Choose a real password: the encryption is only as strong as it.
- Can it compress any PDF to 100 KB?
- No, and it will not pretend to. Image-heavy pages compress well; a born-digital text PDF may already be near its floor. The tool reports the size it achieved rather than silently overshooting.