Free Compress PDF

Results vary by content. PDFs heavy with uncompressed images often shrink 20–60%. Text-only PDFs see smaller gains. OCRFire strips redundant metadata and re-serialises the PDF structure - it doesn't re-encode images, so quality is fully preserved.

No. OCRFire's compression removes structural overhead and redundant metadata rather than re-encoding images at lower quality, so photos and graphics look identical to the original.

There's no enforced file size limit - the tool runs in your browser, so the ceiling is your device's available RAM. PDFs up to several hundred megabytes typically work fine on modern devices.

Some PDFs are already well-optimised. If the original was produced by a tool that applied aggressive compression, OCRFire's re-serialisation pass may add a small amount of overhead, meaning the original was already as compact as it could get.