Formats, file types, and size limits for Compress PDF
Knowing what the compressor accepts and where its limits are helps you get predictable results.
Supported input
The tool works with PDF documents.
| Format | MIME type | Status |
|---|---|---|
| `application/pdf` | Supported |
Size limit
Compress PDF accepts files up to 100 MB. Because everything runs in your browser, the practical processing limit is your device's memory rather than a crowded server — but the upload ceiling is 100 MB per file.
Output
You download a PDF. Depending on the level you choose (or the target size you set), the output file is smaller than the original while staying in the same format, so it opens anywhere a normal PDF does.
Getting the best results
- For text-heavy documents, even a strong level stays crisp
- For image-heavy scans, expect a bigger size reduction at some quality cost
- Keep a backup of the original so you can always re-do it at a lighter setting
- Set a specific target size (100 KB, 1 MB) when you have a hard requirement such as an email attachment limit
Verdict
Compress PDF handles PDF input up to 100 MB and lets you target an exact output size, with nothing leaving your device.