PDF Compressor
Choose a target reduction and make PDF files smaller directly in your browser.
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Choose a target reduction and make PDF files smaller directly in your browser.
Choose a target reduction percentage. Formatza prepares the closest practical browser-based result and shows its estimated final size before download.
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Tool guide
Free Online PDF Compressor
Choose a target size reduction and compress a PDF directly in your browser. Formatza prepares the complete candidate document in the background, shows its estimated download size before compression, and keeps the original when a generated result would be larger.
Steps
How it works
- Upload one PDF and review its original size, page count, and first-page preview.
- Move the target reduction slider from 10% to 90% in clear five-percent steps.
- Compare the original first page with the updated visual-quality preview.
- Review the prepared PDF size and estimated saving calculated from the complete document.
- Compress using the prepared settings, verify the final reduction, and download the finished PDF.
Highlights
Key features
- Provides a continuous 10% to 90% best-effort reduction target instead of fixed presets.
- Shows the prepared whole-document size and estimated percentage saving before final compression.
- Updates the first-page quality preview after the target percentage changes.
- Uses light structure-preserving optimization at the lowest target setting.
- Progressively adjusts visual quality and resolution for stronger targets and only keeps a generated result when it is smaller.
- Processes the document locally with browser-compatible PDF libraries.
Use cases
Common uses
- Make an image-heavy PDF smaller before sharing it.
- Reduce the size of scanned documents and visual reports.
- Choose a practical size-reduction target and compare first-page quality before downloading.
- Optimize a PDF for browser viewing or email attachment limits.
Notes
Limitations to know
- PDFs that already contain optimized images and compressed objects may show little or no size reduction.
- The selected percentage is a best-effort target, not a guaranteed final reduction, because PDF page content and embedded assets vary.
- Targets above the lightest setting may flatten pages into images, so selectable text, links, forms, annotations, and other interactive features may not be retained.
- The lightest target prioritizes document structure and therefore may provide only a small reduction.
- Large, complex, encrypted, malformed, or unsupported PDFs may exceed browser memory or fail to process.
- The visual preview represents the first page, while the displayed PDF-size estimate is prepared from the complete document.
FAQ
Frequently asked questions
Does PDF Compressor work in the browser?
Yes. The PDF is read and processed locally with browser-compatible PDF libraries; no external conversion API is used.
Which compression percentage should I choose?
Start near 50% and review the prepared size and first-page preview. Move lower when document features and visual detail matter most, or higher when a smaller visual PDF is the priority.
Will the compressed PDF keep selectable text?
The lightest target uses structure-preserving optimization. Stronger targets may rebuild pages as compressed images when that creates a smaller result, so text may no longer be selectable.
Will the final PDF be exactly the percentage I select?
Not always. The slider is a best-effort reduction target because PDFs contain different combinations of images, fonts, vectors, and compressed objects. Formatza shows the prepared candidate's actual estimated size before you continue.
Why did my PDF size stay the same?
The source may already be optimized. Formatza does not replace it with a larger generated file or claim savings that were not achieved.
Can I compress a password-protected PDF?
A locked PDF must be unlocked before browser-based compression can read and rewrite it.
Are page size, order, and orientation preserved?
Page order and visual dimensions are preserved. Stronger visual compression renders each page in its displayed orientation, while the lightest target prioritizes the original document structure.