🧩 Base64 Decoder
Paste a Base64 string or upload a .txt file that contains Base64. Decode and download instantly. Supports data URI (data:mime;base64,...).
📝 How to Use
1️⃣ Paste Base64 string or upload .txt file
2️⃣ Click Decode & Download
3️⃣ Optionally preview images client-side
4️⃣ Use preview to confirm file before download
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📝 Base64 Decode Online Tool – Instant, Free & Actually Works
You’re staring at a massive Base64 string in a log file, JWT token, API response, or email attachment… and you have no idea what it says. Don’t waste time with slow, ad-filled websites. Use the fastest and cleanest Base64 decode online tool that thousands of developers, pentesters, students, and curious people rely on every day — 100% free, unlimited, no sign-up. Head straight to Tool100plus.com and get readable text in under 2 seconds.
Why This Is the Only Base64 Decode Online Tool You’ll Ever Bookmark
- Lightning fast – decodes even 500KB+ strings instantly
- Unlimited usage – no “3 decodes per day” nonsense
- Works on phone, tablet, laptop – perfectly responsive
- One-click copy of clean output
- Auto-detects padding issues and fixes them
- Drag & drop files (images, JSON, text files → instant decode)
- Turns base64 images into downloadable PNG/JPG
- 100% private – nothing saved, nothing logged
- No ads, no pop-ups, no tracking
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How to Use This Base64 Decode Online Tool
Takes just 3 seconds:
- Paste your Base64 string (any size)
- Click “Decode” or just wait – it auto-decodes
- Get clean text, JSON, image preview, or downloadable file
- Copy or download with one click
Bonus: Drop a data:image/base64… string and it instantly shows + downloads the picture.
Real Situations Where This Tool Saves Your Day
- Debugging JWT tokens (the middle part is always Base64)
- Opening weird email attachments that are Base64 encoded
- Extracting hidden text from config files or CTF challenges
- Converting Base64 images embedded in HTML/CSS back to real files
- Quickly checking what’s inside API responses during testing
- Students learning web security, APIs, or encoding concepts
- Reversing those “obfuscated” license keys people send
Why Everyone Switches to Tool100plus.com and Never Goes Back
- Dark mode by default (perfect for late-night debugging)
- Shows character count and warnings for invalid padding
- Handles line-wrapped Base64 without complaining
- Mobile-friendly (yes, you can decode on your phone at 1 AM)
- Works even with broken/missing padding (auto-fixes most cases)
- Zero data collection – we don’t want your strings
Stop Clicking Through 10 Sketchy Websites
No more “free decode” sites that:
- Show 5 ads before letting you paste
- Limit string length to 10KB
- Add watermarks to decoded images
- Force you to disable ad-blocker
Just use the one that actually respects your time: tool100plus.com/base64-decode
Bookmark it now. Go decode something right now – try it and see how stupidly fast it is.
❓ FAQ
Paste string or upload .txt and click Decode.
Yes, preview works in browser without upload.
Yes, data:mime;base64,... format is supported.
Yes, Tool100Plus provides it free online.