Image to Base64
Image & Video Tools
Convert an image to a Base64 data URI with ready-to-copy HTML and CSS snippets — in your browser. Free, private, no signup.
How this Base64 converter works
This tool reads your image and produces its Base64 data URI — the text form of the image you can paste straight into HTML, CSS or JSON — with one-click copies for the raw string, an <img> tag and a CSS background. Conversion happens in your browser; the image never leaves your device. The honest part most converter sites skip entirely: Base64 makes files ~33% bigger and un-cacheable, so inlining is a win only for tiny images. This tool shows you the size cost on every conversion and tells you when inlining is a bad idea.
Base64 tips
- Inline tiny assets only — icons and logos under ~5 KB. The +33% size cost and lost caching outweigh the saved request for anything bigger.
- The killer use case: single-file HTML — email signatures, standalone reports, offline pages — where external images can't be referenced at all.
- SVGs often inline better as raw SVG markup than as Base64 — same effect, smaller and readable.
- A data URI in CSS needs no quotes escaping headaches: url("data:image/png;base64,…") works as-is with the copy button here.
- Need it smaller before inlining? Compress or resize the image first — Base64 multiplies whatever size you feed it.
Related tools
Image to Base64 — common questions
Latest questions readers ask us about this topic.
Is my image uploaded anywhere?
No. The file is read with the browser's FileReader and encoded on your device — nothing is transmitted. The output is just text, and it's yours to paste wherever you need it.
Why is the Base64 bigger than my image?
Base64 encodes 3 bytes of binary as 4 characters of text, an unavoidable +33% overhead before compression. That's the cost of representing an image as text — every converter has it, whether or not they mention it.
When should I actually use Base64 images?
When the image must live inside the document: email signatures, single-file HTML reports, tiny icons in CSS where an extra request costs more than the bytes, and JSON payloads that must carry an image. For normal web pages, regular image files with caching are almost always faster.
Does Base64 encoding lose quality?
No — it's a lossless re-encoding of the exact same bytes. Decode it and you get the identical image back. The trade-off is size and cacheability, never quality.
Related questions
The sub-questions readers ask next — answered, with where to go.
Specificity and tension. A scroll-stopping opener promises a concrete payoff ('the 3-word edit that doubled my reply rate') or opens a loop the reader needs closed — not a vague 'let's talk about engagement'. Front-load it: on most feeds only the first line shows before a cut-off, so the hook has to do its work there. Test several angles for the same post; the winner is rarely the one you'd have guessed.
Style your opening lineMatch the length to the job, then check it against the limit. Instagram captions can run long for storytelling but the hook must land in the first ~125 characters before 'more'; X/Twitter rewards tight, standalone lines; LinkedIn truncates around two lines. TikTok and Reels captions are short by nature. The reliable move is to draft freely, then trim against a live counter so nothing important gets cut.
Check the limit liveFewer, and more relevant, than the old advice. The era of 30 generic tags is over — most platforms now reward a small set (roughly 3–8) that genuinely describe the post, mixing one or two broad tags with several specific, lower-competition ones. Stuffing tags reads as spammy and can suppress reach. Put them where they don't interrupt the read: end of the caption or first comment.
Read the content hubTreat the bio as a one-line pitch, not a résumé. Open with who you help and the outcome they get, add a single proof point, and close with a reason to follow or a clear next step. Keep it skimmable, lead with the words people would search, and reserve any styled text for one emphasised phrase. Links and @mentions stay plain so they stay clickable.
Generate a bioExplore the topic cluster
A wider set of tools and guides on this topic.