Compress PDF File Size Online
Optimize and re-save a PDF locally. Choose files and options, then create your result. Files stay on your device during processing.
Hold the ⠿ handle and drag a file to change the order. This works with a mouse or your finger. The ↑ and ↓ buttons also work. Select Remove to discard a file.
File preview
Select a file to preview it before processing.This browser-only rewrite may reduce some PDFs, but it cannot downsample embedded images. The file may stay the same size or become larger.
Processing happens locally in this browser. Your output is downloaded to the device using your browser’s normal download settings. Keep the original file until you check the result.
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A PDF can be large because of high-resolution images, embedded fonts, or repeated resources. NexaToolPro’s browser-only Optimize PDF function rewrites the document structure; it does not downsample images.
How to use Compress PDF
- Select the PDF you want to optimize.
- Choose Optimize and download.
- Compare the original and output sizes shown when the operation finishes.
- If the file is larger or not small enough, keep the original and use a trusted PDF editor that can reduce image resolution.
- Open the output to check fonts, forms, bookmarks, and page appearance.
Before you send the file
Many email services accept attachments of only about 20 to 25 megabytes, and some forms or government portals set a smaller limit, so check the limit first. Open the final file and look at a few pages to make sure text and signatures are still clear. Keep the original, because a smaller copy is for sending, not for archiving, and give the new file a name that says which version it is.
Frequently asked questions
How small should a PDF be to send by email?
There is no single rule. Many services allow about 20 to 25 megabytes in total, but the person receiving it may have a lower limit. For forms and portals read the stated limit.
Will the pages look different after compressing?
This tool does not change image resolution or remove content, so the pages should look the same. Open the result and check a few pages, fonts and forms before you use it.
Can this tool make a scanned PDF searchable?
No. It does not read the text in images. A scanned page stays an image, so the text cannot be selected or searched.
Which tool should I use if the size does not change?
Reduce the size of the source images with Image Resizer or Image Compressor, or split the file with Split PDF so each part is small enough to send.
More PDF tools
- Merge PDF: Merge and reorder PDF files and pages
- Split PDF: Extract page ranges or split every page into separate files
- Rotate PDF: Rotate selected PDF pages to the correct orientation
- Organize PDF: Reorder, rotate or remove PDF pages
- Crop PDF: Crop PDF pages by setting page margins
- Delete PDF Pages: Remove selected pages from a PDF
Want more detail, examples and answers to common questions? Read the Compress PDF guide.