PDF Resizer review
A practical free web compressor for large batches, with a 100 MB combined upload limit.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
PDF Resizer is a browser-based PDF compression tool from SIA Open Idea, founded in 2013. It is aimed at students, professionals, and other users who need to reduce document sizes without installing software or creating an account. The service also includes tools for resizing, merging, splitting, converting, cropping, rotating, and other PDF operations, but its compression workflow is the clearest fit for users handling many documents online.
Compression is organized around High, Medium, and Low quality presets. These settings affect image resolution and visual fidelity, using image downsampling at 300, 150, or 72 dpi depending on the selected preset. The tool also optimizes images and removes unnecessary metadata. That gives users a straightforward way to balance output size against document appearance, although it is less suited to workflows that require preserving original image quality exactly.
The web workflow supports drag-and-drop or file-browser uploads, with batch processing for up to 500 files. The maximum combined upload size is 100 MB, so the service fits large batches of smaller PDFs better than a few very large documents. Uploaded files are automatically deleted after one hour. PDF Resizer is a good choice for free, browser-based batch compression and occasional document management; users who need desktop processing, offline work, or uploads beyond the combined limit should choose a different type of tool.
PDF Resizer pros and cons
- Where it wins
- Three quality presets with 300, 150, or 72 dpi downsampling
- Batch upload supports up to 500 PDF files
- No registration or installation; uploads are deleted after one hour
- Where it doesn't
- The combined upload limit is 100 MB
- Web-only processing requires uploading files online
- Quality presets can reduce image resolution and visual fidelity
PDF Resizer fact sheet, pricing and score →
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