Compress PDF to Exact Size
Upload a PDF and choose the file-size limit required by your form, portal, email, or application. The tool automatically tries to create the smallest readable result. All processing happens locally in your browser.
Choose a PDF to Compress
Drop a PDF here or choose a file
One PDF at a timeWhat Is an Exact-Size PDF Compressor?
An exact-size PDF compressor helps you reduce a PDF to a required file-size limit. You can choose 100 KB, 200 KB, 300 KB, 500 KB, 1 MB, or enter a custom size.
The tool automatically tries different quality and resolution settings. You do not need to understand DPI, image quality, or PDF compression methods.
The selected target is a best-effort goal. Some PDFs cannot reach a very small size without making the pages difficult to read.
How to Compress a PDF to a Required Size
- Choose your PDF. Upload one PDF file from your device.
- Select the required size. Choose a preset or enter a custom target.
- Choose a preference. Select Keep Text Clear, Balanced, or Smallest File.
- Compress the PDF. The tool automatically tries to reduce the file.
- Check the result. Confirm whether the selected target was reached.
- Download the file. Open the PDF and check every important page before submitting it.
How Automatic Compression Works
The tool starts with the settings linked to your selected preference. It creates a compressed PDF and checks the result size.
When the file is still larger than the selected target, the tool may try again with lower image quality or a lower page resolution. Each attempt starts from the original PDF instead of compressing an already compressed result.
The process stops when the target is reached or when the available compression attempts are finished.
Keep Text Clear
Uses higher quality. Suitable for certificates, forms, names, numbers, and small text.
Balanced
Provides a practical balance between page clarity and file size.
Smallest File
Uses stronger compression and may make text or images less clear.
Common PDF Size Targets
Different websites use different upload limits. Always check the exact requirement shown by the form or portal.
| Target | Common Use | Important Note |
|---|---|---|
| 100 KB | Very small single-page documents | May require strong compression |
| 200 KB | Forms, certificates, and strict upload portals | Works best with short documents |
| 300 KB | Short multi-page PDFs | Usually allows better readability |
| 500 KB | Documents containing more pages or detail | Provides more room for images and small text |
| 1 MB | Larger documents and email attachments | Often keeps better page quality |
| Custom | Any limit entered by the user | The entered value must be valid and greater than zero |
Why the Target Size Is Not Guaranteed
Every PDF is different. A one-page certificate may reach 100 KB, while a long document with many scans may not reach the same target.
The final size depends on:
- The number of pages
- The amount of text and image detail
- The page dimensions
- The selected quality preference
- The selected resolution
- Whether the document uses color or grayscale
When the target is too small, the tool shows the closest result it could create. You can then use stronger compression, grayscale, remove pages, or choose a larger target.
What Affects PDF File Size?
Page Count
More pages normally create a larger file. Removing unneeded pages can help meet a small upload limit.
Image Quality
Lower image quality can reduce file size but may make text, stamps, and photos less clear.
Page Resolution
Lower resolution uses fewer pixels and creates a smaller result, but small details may become blurry.
When Grayscale Can Help
Grayscale removes color and keeps shades between black and white. It may reduce the size of scanned forms, notes, letters, and certificates that do not require color.
Do not use grayscale when color contains important information. Examples include photographs, maps, colored charts, highlighted corrections, stamps, and identity documents.
What Strong Compression May Remove
This tool can rebuild PDF pages as images. The compressed result may no longer contain:
- Selectable or searchable text
- Clickable website and email links
- Fillable form fields
- Digital signatures and signature validation
- Bookmarks and document outlines
- Embedded attachments and layers
- Screen-reader tags and document structure
Do not use strong compression when the destination requires searchable text, a working form, or a valid digital signature.
What to Do When the Target Is Not Reached
A target may not be reached when the document contains many pages, large scans, photographs, or detailed graphics.
Try one or more of these actions:
- Select a stronger compression preference
- Use a lower page resolution
- Use grayscale when color is not required
- Remove pages that are not needed
- Split a long document into smaller files
- Choose the next larger target allowed by the portal
Why the Result Can Be Larger
A small text-based PDF may already use very little space. Rebuilding its pages as full-page images can create a result that is larger than the original.
When this happens, keep the original PDF or try a lower quality and resolution setting.
Common PDF Compression Mistakes
- Not checking the final file: open every page before submitting the PDF.
- Deleting the original: keep a backup in case you need better quality or searchable text.
- Selecting the smallest target first: choose the actual limit shown by the website.
- Compressing the result repeatedly: repeated compression can make text progressively worse.
- Ignoring signatures and forms: strong compression may remove them.
- Using grayscale without checking: important color information may be lost.
Browser Memory and Large PDFs
PDF compression can use a large amount of browser memory because every page must be opened, rendered, compressed, and added to a new document.
Large PDFs may process more slowly on phones and older computers. When processing fails, close other browser tabs, use a lower resolution, split the document, or use a device with more available memory.
Browser Processing and File Data
PDF processing is designed to run in the browser. PDF contents, page previews, filenames, passwords, metadata values, and downloaded documents should not be included in analytics events.
The webpage may still load normal website resources and analytics. Browser processing does not mean that the complete page works without network activity.
Related PDF Tools
Frequently Asked Questions
How do I compress a PDF to a specific size?
Upload your PDF, choose a target size, select a compression preference, and start the compression. The tool automatically tries different settings and shows whether the target was reached.
Can I compress a PDF to 100 KB?
You can select 100 KB as a target. A short or simple document may reach it, but a long or detailed PDF may not become that small while remaining readable.
Can I compress a PDF to 200 KB?
Yes, you can select 200 KB. The result depends on the number of pages, page detail, image quality, and resolution.
Is the selected target size guaranteed?
No. The selected size is a best-effort goal. Some documents cannot reach a very small target without making the pages difficult to read.
Why did my PDF not reach the target?
The PDF may contain too many pages, large scans, photographs, or detailed graphics. Try stronger compression, a lower resolution, grayscale, or remove pages.
What happens when the target is too small?
The tool shows the closest result it could create. You can download that result, choose stronger compression, or select a larger target.
How does automatic compression work?
The tool creates several results using different quality and resolution settings. It stops when the target is reached or when the available attempts are finished.
Which compression preference should I choose?
Use Keep Text Clear for certificates and small text, Balanced for normal documents, and Smallest File when reaching a low size is more important than page clarity.
Does lower image quality reduce PDF size?
Yes. Lower quality can reduce file size, but it may make text, photographs, stamps, and graphics less clear.
Does lower resolution reduce PDF size?
Yes. Lower resolution uses fewer pixels for each page and generally creates a smaller file.
Does grayscale reduce PDF size?
It may reduce the size of color scans and image-heavy PDFs. Keep the original color when it contains important information.
Will selectable text remain after compression?
Strong compression may convert every page into an image. Text can remain visible but may no longer be selectable or searchable.
Are links, forms, and signatures preserved?
No. Rebuilding pages as images normally removes clickable links, form fields, bookmarks, and digital signature validation.
Why is the result larger than the original?
A small text-based PDF may already be optimized. Turning its pages into images can create a larger result.
Can a password-protected PDF be compressed?
A protected PDF may need to be unlocked first. Only remove a password when you own the document or have permission.
Does the tool work on mobile?
It can work in supported mobile browsers, but large PDFs may require more memory than a phone has available.
Are PDF contents sent to analytics?
PDF contents, page previews, filenames, passwords, metadata values, and downloaded documents should not be included in analytics events.
Why did compression fail?
The PDF may be damaged, password protected, unsupported, or too large for the available browser memory.