ToolForge

Base64 画像プレビュー

Base64 image viewer: paste a Data URL or raw Base64 to preview the image locally with estimated size. Nothing is uploaded. Ideal for frontend debugging.

使い方

Paste a data:image/…;base64,… URL or raw Base64 to preview instantly with estimated size.

Overview

Base64 Image Viewer is a Developer tool. Paste a Data URL or raw Base64 to preview the image locally with estimated size. Nothing is uploaded. Ideal for frontend debugging. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Daily use of Base64 Image Viewer: Paste a data:image/…;base64,… URL or raw Base64 to preview instantly with estimated size. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use Base64 Image Viewer offline or on poor network — all calculations stay local and private.
  • Escape code for string literals
  • Format and validate JSON

How to use

  1. 1 Paste a data:image/…;base64,… URL or raw Base64 to preview instantly with estimated size..
  2. 2 Pick action and options
  3. 3 Fix highlighted errors
  4. 4 Copy or export

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Disable live validation for large files
  • Watch greedy vs lazy regex
  • Strict JSON disallows comments/trailing commas

FAQ

Why invalid?
Trailing commas, single quotes or BOM often cause it.
Offline?
Yes, parsing is local.
How is Base64 Image Viewer different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “base64 image, Data URL” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
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