This base64 size reference table shows the base64 encoded size for a range of original file size values. Every figure is computed with the same engine that powers our Base64 Size Calculator, so the numbers are exact.
| Original file size | Base64 encoded size | Size increase |
|---|---|---|
| 250 bytes | 336 | 34.4% |
| 500 bytes | 668 | 33.6% |
| 750 bytes | 1,000 | 33.3% |
| 1,000 bytes | 1,336 | 33.6% |
| 1,500 bytes | 2,000 | 33.3% |
| 2,000 bytes | 2,668 | 33.4% |
| 3,000 bytes | 4,000 | 33.3% |
| 5,000 bytes | 6,668 | 33.4% |
| 7,000 bytes | 9,336 | 33.4% |
| 10,000 bytes | 13,336 | 33.4% |
How to use this table
Find the row closest to your original file size and read across to the base64 encoded size. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Base64 Size Calculator for a precise answer.
Need a value that is not in the table? — the Base64 Size Calculator does it instantly, for free, with the formula and a worked example built in.
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