Trims PDF file size by stripping redundant metadata and optimizing object streams — best on text-heavy documents. Cannot recompress embedded images (the main size driver); for scan-heavy PDFs use Bulk PDF Size Reducer. Handles PDFs up to 125MB. Documents stay on your device — editing and conversion run locally in your browser.
Runs on pdf-lib
Content reviewed October 2026 · About Toolzum
Shrink stacks of PDFs 40–90% with Maximum, Balanced, or High-Quality tiers that recompress images and strip metadata. Firms email 25 filings instead of courier — local pdf-lib work, 2 free batches a day.
Reduce file size of multiple PDFs at once by compressing images and removing metadata. Law firms preparing document batches for email. Everything runs locally in your browser — nothing is uploaded.
Converts standard PDF files to PDF/A archival format with proper metadata, embedded fonts, and color profiles. Documents stay on your device — editing and conversion run locally in your browser.
Hit exact file-size targets (10/25/50/100 MB, default 50) across video batches for email and messaging caps. Teams fit 15 clips under Gmail's 25 MB wall — local FFmpeg WASM, 2 free batches a day.
Decode QR codes from uploaded images. Scan any QR code image and extract the embedded text or URL. Point it at screenshots, photos, or documents — decoded URLs and text copy out instantly. Runs locally, free, no signup.
Depends on the file: text-heavy PDFs with bloated metadata shrink noticeably; scanned/image-heavy PDFs barely change, because this tool cannot recompress embedded images — it says so on screen. For scans, use Bulk PDF Size Reducer instead.
PDFs up to 125 MB are supported — the same intake ceiling as the rest of the PDF tools. Very large files may take longer to process.
No. Nothing is re-rendered: text stays crisp and fully selectable. Only metadata and object streams are touched, so there is no quality trade-off — and no dramatic image savings either.
No. All optimization runs locally in your browser using PDF-lib. Your document never leaves your device.
You will need to remove the password protection first using a PDF unlock tool. The optimizer can then process the unlocked PDF normally.
Bulk PDF Size Reducer
Shrink stacks of PDFs 40–90% with Maximum, Balanced, or High-Quality tiers that recompress images and strip metadata. Firms email 25 filings instead of courier — local pdf-lib work, 2 free batches a day.
PDF Merger
Combines two or more PDF files into one contiguous document with up/down buttons to order the input list. Legal assistants compiling.