UUtilityAIWorkspace

File Tools

File Converter

Convert text-based files between formats. Upload files, choose a target format, and download the converted versions.

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File Converter

About the File Converter

The File Converter changes the extension of text-based files between TXT, CSV, JSON, XML, HTML, and MD. It reads the file as text and re-saves it with your chosen extension. It does not transform the content’s structure — only the file type label changes.

This tool runs entirely in your browser. Your files never leave your device.

How to use the File Converter

  1. 1Open the File Converter and select text files.
  2. 2Choose a target format.
  3. 3Click Convert on each file to download it with the new extension.

How the File Converter works

For the File Converter specifically, it changes the extension of text-based files between TXT, CSV, JSON, XML, HTML, and MD. File tools read text-based files with the browser’s File API and process the contents in memory using standard string operations — splitting on line breaks, joining with separators, hashing byte arrays, or transforming case. No file is uploaded: the bytes stay in your browser tab and are cleared from memory when you close it, so copy or download any result you want to keep. The tools work with text-based formats including TXT, CSV, JSON, XML, HTML, CSS, JS, MD, and LOG; binary formats are not supported for text operations. The Encryption tool is distinct and uses AES-256-GCM, an authenticated symmetric cipher, with a key derived from your password via PBKDF2 with 100,000 iterations. AES-GCM encrypts the file and appends an authentication tag that detects any tampering on decryption. Because the key is derived solely from your password, there is no recovery path — lose the password and the file is mathematically unrecoverable, by design. Store encryption passwords in a password manager before encrypting anything you cannot afford to lose. The Duplicate Finder hashes file bytes (not names), so renamed copies of the same file are still detected as duplicates. The Checksum Generator uses the Web Crypto API to produce SHA-1, SHA-256, SHA-384, or SHA-512 hashes for integrity verification. The File Comparison tool compares two text files line by line by position, so it is a positional diff rather than a semantic or word-level merge.

How this tool handles your data. This tool runs entirely in your browser. Files are read with the browser’s File API and processed in memory, and the results are generated as downloads on your device — your documents never touch UtilityAIWorkspace’s servers or any third-party service. Closing the tab clears the working data from memory, so copy or download any result you want to keep.

Supported formats & limitations. The file tools work with text-based formats including TXT, CSV, JSON, XML, HTML, CSS, JS, MD, and LOG. Binary formats are not supported for text operations. For best performance, work with files under 50 MB. The Encryption tool uses AES-256-GCM with a PBKDF2-derived key and has no recovery path if you lose the password.

Practical workflow. In practice, you work through a short sequence: 1. Open the File Converter and select text files 2. Choose a target format 3. Click Convert on each file to download it with the new extension. It is well suited to renaming a .txt file to .csv or .md; changing a file extension to match a tool’s expectation; quickly relabelling text files in bulk.

Best practice. Keep a backup of your original file before converting, splitting, or encrypting, and store any encryption password in a password manager because there is no recovery path.

Tips & common pitfalls. With the File Converter in particular, renaming a .txt file to .csv or .md. Keep a backup of your original file before converting, splitting, or encrypting, because most operations produce a new file and some are one-way. Store any encryption password in a password manager before encrypting — there is no recovery path if it is lost. The tools work with text-based formats only; binary files are not supported for text operations. For large batches, process in groups to keep the browser responsive. The Duplicate Finder hashes bytes, so renamed copies are still detected.

Troubleshooting

The first thing to know about the File Converter: it reads the text and saves it with a new extension. If a file will not load, confirm it is a text-based format (TXT, CSV, JSON, XML, HTML, CSS, JS, MD, LOG) — binary files are not supported for text operations. If the File Converter produces a file that will not open, the extension was relabelled but the content structure was not transformed; open it in a text editor. If decryption fails with a wrong-password error, the password does not match — there is no recovery path, so keep passwords in a manager. If the Duplicate Finder misses copies, it hashes bytes, so renamed identical files are still caught but modified files are not. If processing is slow, work with files under 50 MB and process large batches in groups.

Common use cases

  • Renaming a .txt file to .csv or .md.
  • Changing a file extension to match a tool’s expectation.
  • Quickly relabelling text files in bulk.

Frequently asked questions

Tap a question to expand the answer.

Frequently Asked Questions About This Tool

1. Is my data secure when using this tool?

Yes. Every file tool on this page runs entirely in your browser using the File API. Your files are read and processed in memory and never leave your device, making these tools suitable for sensitive documents.

2. What file formats are supported?

The tools work with text-based formats including TXT, CSV, JSON, XML, HTML, CSS, JS, MD, and LOG. Binary formats are not supported for text operations.

Last reviewed: October 2026

About the File Tools

The File Tools are 15 browser-based utilities for managing text-based files — convert formats, merge and split files, compress, extract content, batch-process, edit, rename, find duplicates, analyse sizes, generate checksums, encrypt, view metadata, compare files, and recover corrupted text.

Every operation runs locally in your browser, so your files never leave your device. This makes the tools suitable for sensitive documents that you would rather not upload to a third-party server.

They are built for developers, writers, and anyone who handles text files regularly and wants quick, private operations without installing desktop utilities or trusting an unknown upload service.

Optimize and Manage Your Files in Real-Time

Traditional desktop file managers force a context switch: open an application, import a file, wait for a conversion, export, then clean up. Browser-based file utilities collapse that workflow into a single tab. The tools on this page read files with the browser’s File API and process them in memory using JavaScript — converting formats, merging documents, splitting by line count, compressing whitespace, and renaming in batches — then hand the result back as a download, all without installing software.

Tasks that once meant opening a spreadsheet to re-save a CSV, or a dedicated archiver to inspect a file, become a one-click operation. Because the work happens in the browser’s memory, results appear as soon as processing completes, with no queue and no upload progress bar. This suits developers normalising logs, writers combining chapter drafts, and anyone who needs a quick transformation without trusting an unknown upload service.

Core File System Utilities

The File Converter relabels text-based files between TXT, CSV, JSON, XML, HTML, and MD by reading the content and re-saving it with a new extension. The File Rename Batch applies a prefix, suffix, find-and-replace, and sequential numbering across many files at once, previewing each new name before download. The File Compressor strips redundant whitespace from text files to reduce their size — it does not create zip archives. The File Merger joins multiple text files into one with a separator, and the File Splitter divides a large file into parts by line count.

A Checksum Generator (SHA-1/256/384/512), Duplicate File Finder, File Size Analyzer, File Metadata Viewer, File Editor, File Extractor, File Comparison tool, Batch File Processor, File Encryption (AES-256-GCM), and File Recovery Helper round out the set, covering integrity checks, cleanup, editing, and recovery.

Privacy Standards for Local File Management

Every file tool on this page runs locally in your browser. Files are read with the File API and processed in memory, and the results are generated as downloads on your device — your documents never touch UtilityAIWorkspace servers or any third-party service. This makes the tools appropriate for confidential contracts, proprietary source code, and sensitive logs you would not upload to a cloud converter.

The Encryption tool derives a key from your password with PBKDF2 and applies AES-256-GCM entirely in the browser; there is no recovery path if you lose the password. Because nothing is uploaded, there is also nothing to delete — closing the tab clears the working data from memory.

How to use these tools

  1. 1Choose a tool from the sidebar.
  2. 2Upload one or more files using the drop zone, or paste text directly for editor tools.
  3. 3Configure any options (target format, line count, operation, password) and run the action.
  4. 4Download the processed file or copy the result.

What each tool does

File Converter
Reads text-based files and re-saves them with a new extension (TXT, CSV, JSON, XML, HTML, MD).
File Merger
Combines multiple text files into one with a file-break separator; reorder before merging.
File Splitter
Divides a text file into smaller parts by line count and downloads each as a separate file.
File Compressor
Reduces text file size by collapsing redundant whitespace; does not create zip archives.
File Extractor
Pulls a line range, search matches, emails, or URLs from a text file locally.
Batch File Processor
Applies one transformation (case, trim, numbering) to many text files at once.
File Editor
Opens a text file with find-and-replace and downloads the edited version.
File Rename Batch
Renames many files with prefix, suffix, find-and-replace, and sequential numbering.
Duplicate File Finder
Groups identical files by size and content hash so you can spot true duplicates.
File Size Analyzer
Shows total, average, and per-type size breakdowns plus the largest files.
Checksum Generator
Computes SHA-1/256/384/512 hashes to verify file integrity after transfers.
File Encryption / Decryption
Encrypts files with AES-256-GCM and a password; decrypts .enc files locally.
File Metadata Viewer
Displays name, size, type, extension, and last-modified date; exports CSV.
File Comparison
Compares two text files line by line and colour-codes additions, removals, and changes.
File Recovery Helper
Recovers text from corrupted files via encoding fixes, text extraction, or JSON repair.

Common use cases

  • Developers converting, merging, and minifying code and data files.
  • Writers and researchers splitting large documents and extracting emails or URLs.
  • Anyone encrypting sensitive files with AES-256 before storing or sharing them.
  • Teams finding duplicate files and analysing folder sizes before cleanup.
  • Users repairing or recovering text from corrupted files.
  • Data analysts extracting structured content from logs and exports.

Expert tips & best practices

  • 1Always keep a backup of your original file before running a conversion or split — the tools process locally, but a backup protects against unexpected results.
  • 2Use the checksum generator to verify file integrity after transfers; matching SHA-256 hashes confirm a file arrived unchanged.
  • 3When merging files, reorder them before running so the combined document reads in the right sequence.
  • 4For encryption, choose a long, unique password and store it in a password manager — there is no recovery path if you lose it.
  • 5Run the duplicate finder on download and archive folders periodically to reclaim storage and avoid confusion between identical files.

Frequently asked questions

Are my files uploaded to a server?+

No. All file tools process data entirely in your browser. Your files never leave your device.

What file types are supported?+

The tools work with text-based formats including TXT, CSV, JSON, XML, HTML, CSS, JS, MD, and LOG. Binary formats are not supported for text operations.

How does the encryption tool work?+

The encryption tool uses AES-256-GCM with a password you choose. The file is encrypted locally and downloaded as a .enc file. Keep your password safe — there is no way to recover it.

Can I process multiple files at once?+

Yes. The Batch Processor, File Merger, Rename Batch, Duplicate Finder, Size Analyzer, and Checksum Generator all support multiple files.

Is there a file size limit?+

Because processing happens in your browser, very large files may be slow. For best performance, work with files under 50 MB.

How do I verify a file was not tampered with?+

Generate a SHA-256 checksum before and after transferring a file. If the two hashes match exactly, the file is unchanged; any difference indicates the content was altered.

Privacy & security: UtilityAIWorkspace tools process your data in your browser whenever possible. Your files and content are not uploaded to a server for local tools, and AI-powered features transmit only what is needed to fulfil your request. Read our Privacy Policy and Terms of Service for full details.