How to use Image to Base64
- Choose or enter a supported source.
- Review controls and format limitations.
- Download the locally generated result.
Image to Base64
Convert a local image to raw Base64 or a data URL with strict size limits.
Convert a local image to raw Base64 or a data URL with strict size limits. Processing stays on your device and the original remains unchanged.
How OpenFileTools processes it
Local processing, explicit choices.
The source is validated and processed in this browser tab. Large format codecs are loaded only on the relevant page; no image bytes are uploaded.
Quick technical summary
What this tool changes.
| Property | Behavior |
|---|---|
| Processing | Browser only; no image upload |
| Original | Never changed |
| Modes | Raw Base64 and data URL |
| Reporting | MIME, bytes, characters, approximate overhead |
Choose raw Base64 or a complete data URL
Binary image bytes are encoded locally. Raw mode returns only Base64 characters; data URL mode prepends the image MIME type for direct embedding.
- Base64 text is usually about one-third larger than binary.
- Strict input limits prevent oversized text fields.
Questions, answered.
Why is Base64 larger?
It represents each three binary bytes with four text characters.