Base64 Encoder & Decoder
Featured
Encode and decode text with Base64.
- On your device
- No signup
Developer topic guide
Encoding tools
Base64, URL, and HTML encoding utilities for developers — free and browser-based.
3 free tools in this guide — pick one below to get started.
Tools in this guide(3)
Open a tool to calculate, convert, or edit — no signup required.
Overview
Encoding tools translate binary or special characters into transport-safe text. Base64 Encoder handles attachments and data URLs. URL Encoder escapes query parameters. HTML Encoder escapes entities for template safety.
Encoding is not encryption. Do not use Base64 alone to protect secrets.
When chaining encodings, decode in reverse order of application to recover the original string.
How to choose
- Binary-to-text → Base64 Encoder.
- Query strings → URL Encoder.
- XSS-safe entities → HTML Encoder.
Frequently asked questions
Is Base64 encryption?
No. It is reversible encoding anyone can decode.
URL encode vs URI encode?
Tools follow standard percent-encoding rules documented on each page.
Are inputs logged?
Processing runs on your device; Utilnivo does not store encoded content.
Step-by-step workflows (10)
Multi-step guides that chain tools from this topic—follow numbered steps instead of guessing tool order.
- Debug a JWT or API tokenDecode a bearer token, pretty-print JSON claims, and inspect Base64 segments.3 steps
- Provision staging credentialsGenerate passwords, UUIDs, and hashes for dev, QA, and fixture data.3 steps
- Debug a failing APIReproduce the request, format the JSON response, inspect JWTs, and compare payloads.5 steps
- Validate JSON before deployValidate syntax, pretty-print, generate a schema draft, and diff against the previous payload.4 steps
- Ship a CSS UI tweakPrototype in the playground, generate layout and effect CSS, then check contrast.6 steps
- Turn a spreadsheet into an API payloadPreview CSV, convert to JSON, format, and validate before posting to an API.4 steps
- Verify a download with checksumsHash the file you downloaded, compare digests, and encode strings when docs ship Base64.3 steps
- Pre-launch domain and TLS checkConfirm DNS, WHOIS, SSL certificates, and security headers before go-live.4 steps
- Write and test a regexTest patterns live, consult cheat-sheet examples, and diff sample outputs.3 steps
- Backend ops cheat sheetBuild cron schedules, explain expressions, convert timestamps, and tidy env files.4 steps