Developer Tools
Image to Base64 Converter
Encode any image into a Base64 data URI entirely in your browser — ready for CSS, HTML, or JSON payloads.
The file is encoded locally with FileReader — nothing is uploaded. Best for small icons and textures, not large photos.
Inline Is Not Automatically Faster
Base64 encoding grows files by ~33%, and inlined images cannot be cached separately from the document that contains them — so a 200 KB logo inlined into every page view costs more than the same logo served once from cache. Inlining wins for small, rarely-changing images (icons under ~2 KB) where saving one HTTP request matters more than the size overhead. The output also belongs in CSS or a build step, not hand-pasted into HTML — and never inline the same large image on multiple pages.
How the Tool Works
- Drop or pick an image (PNG, JPG, WebP, GIF, SVG up to a few MB).
- The file is read as a data URI using the FileReader API — nothing is uploaded.
- Output is offered in three forms: raw Base64, data:image/...;base64, URI, and a ready CSS background-image rule.
- Size comparison shows the Base64 overhead (~33% larger than the binary) before you commit.
Example Input & Output
Common Questions
When should I NOT use Base64 images?
For large photos: Base64 inflates size by a third, cannot be cached independently, and blocks parser streaming. Use it for small icons and textures only.
Is my image uploaded?
No. FileReader works entirely locally; the encoded string is produced in your browser memory.
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