FREE BROWSER TOOL
Compress PDF
Compress PDF files and reduce PDF size by optimizing supported images while retaining text and vectors. Compare actual savings locally, free without uploads.
Your files stay on your deviceMake your PDF smaller
Your PDF stays on your device.
Up to 50.0 MiB and 1,500 pages. Large embedded images may need a smaller document.
Optimizes supported images while keeping text and vectors. Image quality may decrease. Text-only or already optimized PDFs may not get smaller.
Or drop one PDF here. It is analyzed locally.
Choose a PDF to see whether its images can be optimized.
What this tool is for
Reduce the size of PDFs containing supported photos or scans by optimizing their embedded images. Text, vectors, and links stay in the original structure. Suitable image-only documents can use local scan rendering when direct image optimization cannot help. Image-heavy files often benefit more than text-only reports. Actual savings are checked after processing, and the original is recommended when a smaller candidate is not worthwhile.
How to reduce PDF file size
- Choose or drop one unlocked PDF. Check its original size, page count, and image analysis.
- Choose Light, Balanced, or Strong. Select Compress PDF and wait for the measured result.
- If the file is meaningfully smaller, download the compressed PDF and review its image quality. Otherwise, keep your original.
A few things to know
Is my PDF uploaded?
No. Your PDF stays on your device. Analysis and output creation run in local workers; scan rendering uses local browser canvases. No server upload or cloud fallback is used.
Which compression level should I choose?
Balanced is the default for everyday documents. Light keeps higher image quality, while Strong reduces image resolution and quality more aggressively. All three preserve text and vector content; inspect fine print in scanned pages before sharing.
Why did my PDF not get smaller?
Text-heavy PDFs and already compressed images may offer little room for improvement. Unsupported embedded images are preserved unless the document qualifies for image-only scan compression. A larger candidate or a reduction below 1% or 1 KiB is discarded rather than offered as a successful compression.
Will text remain selectable?
Yes. Pages with text, including invisible OCR, are excluded from scan rendering. We do not apply OCR. Scanned text that was already part of an image stays an image. Page dimensions, vectors, and links are preserved. Interactive forms, signed PDFs, and portfolios require a flattened copy first.
Which images can be optimized?
The tool optimizes suitable 8-bit RGB or grayscale JPEG images and supported Flate-compressed image streams, including common PNG and TIFF predictors and ASCII85 wrappers. When direct optimization cannot help, suitable image-only documents may use local scan rendering. Other unsupported structures stay unchanged. This is not a repair, sanitization, or professional color-proofing tool.