Compress PDF files online for free without installing software. Choose a target file size such as 100KB or 200KB, or use Lossless, Balanced, or Maximum compression. Your PDF is processed directly in your browser, so the PDF itself is not uploaded to a server.
How to Compress a PDF Online
Compressing a PDF is simple and takes only a few steps:
- Select your PDF file or drag and drop it into the upload area.
- Choose a compression mode: Target Size, Lossless, Balanced, or Maximum.
- If you choose Target Size, enter the maximum file size you need, such as 100 KB, 200 KB, or 500 KB.
- Click the Compress PDF button.
- Wait while the PDF is processed in your browser.
- Check the original size, new size, and reduction percentage.
- Click Download Compressed PDF to save the compressed file.
Why Use Our PDF Compressor?
The Target Size option will try multiple compression settings to reach your requested file size. If the target cannot be reached, the tool will provide the smallest practical result it was able to produce.
- Target a specific size: Try to reduce your PDF below 100KB, 200KB, 500KB, or any other size you need.
- Lossless compression: Optimize the PDF structure without intentionally reducing image resolution or quality.
- Balanced compression: Reduce file size while maintaining a practical level of visual quality.
- Maximum compression: Prioritize a smaller file size when quality is less important.
- No software installation: Everything runs directly in your web browser.
- Privacy-focused processing: Your PDF is processed locally in the browser rather than uploaded to our server.
- Free to use: No account or subscription is required.
Compress a PDF to a Specific Size
Many websites, application forms, examination portals, government services, and job applications require documents to remain below a specific file-size limit.
For example, you may need:
- PDF under 100KB
- PDF under 200KB
- PDF under 500KB
- PDF under 1MB
- PDF under 2MB
Enter your required size in the Target Size option and the compressor will try several compression settings to find a smaller result.
However, don’t promise that every PDF can reach the requested size. Some PDFs are already highly compressed, contain scanned images, or contain other data that makes further reduction difficult.
Which Compression Level Should I Choose?
| Mode | Best for | Quality |
|---|---|---|
| Target Size | Application/form size limits | Depends on required size |
| Lossless | Keeping original visual quality | Highest |
| Balanced | Everyday PDF compression | Good |
| Maximum | Getting the smallest practical file | May decrease |
What does it mean: Explained
- Lossless: Best when maintaining the original appearance is more important than achieving the smallest possible file.
- Balanced: A good choice for documents containing images where you want meaningful size reduction without aggressive compression.
- Maximum: Useful when a strict file-size limit is more important than maintaining maximum image quality.
Does PDF Compression Reduce Quality?
It depends on the compression method.
Lossless optimization generally avoids intentionally reducing image quality or resolution. Image-based compression, however, can reduce file size by lowering image resolution and/or JPEG quality.
Therefore, if you need to submit an important document, always open the compressed PDF and check that:
- Text is readable
- Images are clear enough
- Signatures are visible
- Scanned documents remain legible
- The final file meets the required size limit
PDF Compression Limitations
PDF compression does not guarantee that every file will become smaller.
For example:
- A PDF may already be highly optimized.
- Some PDFs contain already-compressed JPEG images.
- Digitally signed PDFs may have compatibility or signature considerations after modification.
- Very aggressive image compression can reduce visual quality.
- A requested target size may not always be achievable.
- Compressing a PDF can potentially remove or alter some advanced PDF features depending on the source document and compression process.
Always check the resulting PDF before submitting it to an important website or organization.
FAQs
Can this tool actually compress a PDF below 100KB or 200KB?
It can try, but no honest PDF compressor can guarantee a specific target for every document. Our Target Size mode tests multiple compression profiles and reports whether the requested target was actually reached. If it cannot reach the target, it shows the smallest result found instead of falsely claiming success.
Why can’t every PDF be reduced to the exact size I enter?
PDFs are not all built the same way. A document containing large scanned images may have much more compression potential than a PDF that is already optimized. At very small targets, reaching the requested size may require unacceptable image degradation, so the tool may stop at the best practical result it can produce.
How does Target Size compression work?
The tool does not simply apply one fixed compression setting. It tries a sequence of increasingly aggressive image-compression profiles and checks the resulting file size. Once a result reaches your requested target, that result is used. If none of the profiles reaches the target, the smallest result found is returned.
Why does the tool sometimes say the target could not be reached?
That message is intentional. We believe a compressor should report the actual result rather than pretend that a target was achieved. Your PDF may contain content that cannot be reduced enough with the available compression settings without causing excessive quality loss.
Does “Lossless” mean the PDF will always become smaller?
No. Lossless optimization is designed to avoid intentionally reducing image quality or resolution, but it cannot guarantee a smaller file. If the original PDF has already been optimized, the resulting file may be almost the same size or may not become smaller at all.
Why can Maximum compression make a scanned document look worse?
Maximum compression uses more aggressive image downsampling and JPEG compression. This can substantially reduce file size, but fine text in scans, signatures, photographs, and other image details may become less sharp. For important documents, compare the compressed PDF with the original before submitting it.
Which mode should I use when a government or application website says “PDF under 200KB”?
Choose Target Size and enter 200 KB. After compression, check the displayed New Size and open the downloaded PDF to confirm that the document remains readable and that the receiving website accepts the resulting file.
Why is a PDF with only a few pages sometimes larger than a PDF with many pages?
Page count alone does not determine PDF size. A short scanned document can contain high-resolution images and therefore be much larger than a long text-based document. Embedded fonts, images, graphics, metadata, and other PDF objects also affect file size.
Is my PDF sent to a server while it is being compressed?
The compression process is designed to run locally in your browser using browser-based processing. The PDF itself is not intentionally uploaded to a remote compression server. This makes the tool useful when you prefer not to send a document to an online file-processing service.