How to preview TXT, CSV, and JSON in your browser
Inspect small text files and format JSON without sending their contents to an external server.
Choose a TXT, CSV, or JSON file within the current limit.
Review the preview and format JSON when needed.
Download a cleaned copy and keep the original file.
Why preview locally
Text files from exports, downloads, and email attachments can contain anything — including content you would rather not send to a random online viewer. A browser-based preview reads the file on your device without uploading it, so you can inspect a TXT, CSV, or JSON file's contents before deciding what to do with it.
JSON deserves structure
Minified JSON — one endless line — is unreadable until it is formatted with indentation. The preview's JSON formatting turns an impenetrable line into a navigable tree, which is the difference between guessing and actually understanding an API response or configuration file. Check for unexpected fields before importing data anywhere.
Know the limits
The current preview is designed for small text files; very large files need a different, asynchronous approach. For working with CSV and JSON data rather than previewing it — converting, de-duplicating, restructuring — the CSV/JSON tools handle the job with size limits stated on each page.
Keep files small
The in-browser preview is designed for small text payloads. Multi-megabyte logs or datasets stress phone memory — split or sample them with desktop tooling instead. This preview is about clarity and safety, not replacing a dedicated log analyzer.
Clean JSON deliberately
When pasting or previewing JSON, unformatted input stays readable after formatting passes. A small manual check — valid opening bracket, matching nesting, correct commas — makes the formatted copy trustworthy before you download and ship it.
Before you open the file
A text file is data you read rather than run. Do not paste it into a terminal or double-click a script-like TXT in a command line — the tool treats the content as data to view and format, not as instructions to execute.
Formatting is not validation
A JSON view that looks tidy can still fail strict parsing elsewhere — trailing commas and single quotes are tolerated by some previews and rejected by strict parsers. Before importing the data into another system, run it through the JSON tool's validation path and fix what it flags.
File Maktab content is educational and reflects current tool limits. No affiliate links are active in this version.