Optimize and reduce PDF file size securely inside your web browser.
Select a quick percentage preset or adjust the slider to set your target file size reduction.
The ATOZPDF Compress PDF tool reduces document file sizes using client-side image downsampling and PDF 1.5 object stream consolidation. All processing executes privately within your web browser, ensuring that sensitive documents are never uploaded to remote servers.
Unlike basic converters that rasterize entire pages into blurry images, ATOZPDF selectively optimizes raster images while leaving page content streams, selectable vector text, fonts, hyperlinks, bookmarks, and form fields completely untouched.
The tool combines intelligent raster image downsampling and JPEG re-encoding with PDF 1.5 object stream consolidation. All processing executes securely in your browser without uploading files.
ATOZPDF provides three modes: Target Percentage Reduction (with 25%, 50%, 70% presets and custom slider), Target Final Size in MB, and Automatic Optimization Tiers (High Quality ~200 DPI, Balanced ~144 DPI, Smaller File ~96 DPI).
No. Vector text, font glyphs, layout geometry, hyperlinks, and bookmarks are 100% preserved without rasterization. Only embedded raster images are scaled or recompressed based on your chosen target.
If a document consists purely of vector text or already compressed images, or if your target size is lower than the structural text and font data floor, the tool preserves original quality rather than degrading the document.
No. All PDF compression happens entirely inside your web browser using client-side JavaScript. Your documents never leave your device.
Encrypted PDFs must be unlocked before compression so the browser engine can read and reorganize the object hierarchy.