PDF File Size Checker
See the exact size in bytes, KB and MB, checked against common upload limits.
Portals reject files for being a few kilobytes over a limit and rarely say by how much. This reports the exact size in every unit and checks it against the limits Indian application forms commonly impose, so you know whether you need to compress and by how much.
Your file never leaves your device. It is read and processed by JavaScript running in this tab. Nothing is uploaded or stored.
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Result
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What the PDF File Size Checker does
Operating systems disagree about file sizes. Windows reports binary megabytes, where 1 MB is 1,048,576 bytes; some systems and most upload limits use decimal megabytes, where 1 MB is 1,000,000 bytes. A file that looks like 4.9 MB in one place can be over a 5 MB limit in another.
This tool shows the exact byte count, which is unambiguous, alongside binary KB and MB — and tells you exactly how much over a limit you are when you exceed one.
How to use this tool
- Select your PDF. The size is read immediately from the file itself, without parsing the document.
- Read the exact byte count — that figure is not open to interpretation.
- Check the limit table to see which common upload caps the file fits.
- If it is too large, the tool tells you by how much, so you know what reduction is needed.
How file sizes are calculated
Bytes are exact — everything else is derived:
KB = bytes ÷ 1024
MB = bytes ÷ 1024 ÷ 1024
GB = bytes ÷ 1024 ÷ 1024 ÷ 1024
These are binary units, matching how Windows and most software
report size. Some systems use decimal units (1 MB = 1,000,000
bytes), which makes the same file appear about 5% larger.
When a limit matters, compare byte counts, not rounded MB.
Worked example
Example: a file near a 2 MB limit
| Exact size | 2,148,732 bytes |
| Binary | 2,098.37 KB = 2.049 MB |
| Against a 2 MB limit | too large by 51 KB |
A file displayed as "2 MB" by a file manager is over a 2 MB limit. Knowing it is 51 KB over tells you a small quality reduction will be enough.
What your result means
The byte count is the only unambiguous figure. Use it when a limit is tight.
"Too large by X" tells you how aggressive the compression needs to be. Fifty kilobytes over is a small adjustment; two megabytes over needs a different approach.
If you are close to a limit, aim to land 10% under it rather than just beneath, since some portals count the encoded upload rather than the raw file.
Important considerations
- Binary and decimal megabytes differ by about 5%. When a portal states a limit without specifying, assume the stricter binary interpretation.
- Email attachment limits apply after encoding, which adds roughly 33% to the size. A 20 MB file will not attach to a 25 MB limit reliably.
- The quickest size reductions for a scanned PDF are lower image resolution and fewer pages, not clever compression.
- Splitting a document into parts is often more practical than compressing it heavily, when the portal accepts multiple uploads.
- This tool reads only the file size and does not parse the document, so it works on encrypted and damaged PDFs too.
Limitations of this tool
- It reports size only. To find out what is making a file large, use the page counter and image extractor.
- It cannot know which unit convention a particular portal uses; when a limit is tight, aim comfortably under it.
Frequently asked questions
Why does my file show a different size elsewhere?
Because of binary versus decimal megabytes. Windows shows binary (1 MB = 1,048,576 bytes); many websites use decimal (1 MB = 1,000,000 bytes). The byte count shown here is exact and unambiguous.
My PDF is just over the limit — what is the quickest fix?
For a scanned document, run it through the compress tool at a slightly lower resolution. For a text PDF, compression will not help much — split it or remove pages instead.
Does this upload my file to check the size?
No. The size is read directly from the file on your device by the browser. Nothing is transmitted.
Can it check an encrypted PDF?
Yes. It reads only the file size and never parses the document, so password protection makes no difference.