What am I actually looking at in the hex dump?

Each byte of the file shown as a two-digit hexadecimal value, with the equivalent ASCII character (where printable) shown alongside for context.

Is this useful if I'm not a developer?

It's mainly aimed at debugging file formats, verifying headers, or general curiosity about a file's structure — casual users usually won't need it, but it's harmless to explore.

Can I view very large files this way?

It works on any file, though very large files produce a very long dump — it's most practical for smaller files or inspecting just the header region.

Does Hex Viewer upload my files to a server?

No. Hex Viewer runs entirely in your browser using on-device processing, your files never leave your device.

Hex Viewer

View the raw bytes of any file as a hex and ASCII dump.

Runs in your browser

Drop any file to view its bytes in hex

Choose File

About this tool

Most files are opaque once you're below the level of whatever app normally opens them — a text editor shows text, an image viewer shows pixels, but neither shows you the actual bytes making up the file. This tool displays any file's raw contents as a hex and ASCII dump, letting you inspect a file's structure directly, which is useful for debugging file format issues, verifying a file header, or just understanding what's actually inside a file at the byte level.

Frequently asked questions

File Type Detector

Detect a file's true type from its byte signature, not just its extension.

File to Base64 Converter

Encode any file as Base64, or decode Base64 back into a downloadable file.

Zip & Unzip Files

Combine files into a ZIP archive, or extract files from one.

File Size Converter

Convert between bytes, KB, MB, GB, and their binary (KiB/MiB/GiB) equivalents.

Duplicate File Finder

Find identical files among a batch by comparing their content hash.

Batch File Renamer

Rename many files at once using a pattern, and download them as a ZIP.

File Extension Changer

Rename a file's extension without converting its actual format.

File Metadata Viewer

View a file's name, size, type and last-modified date.

GZIP Compressor

Compress or decompress a file using GZIP.

File Checksum Verifier

Verify a downloaded file against a published SHA checksum.

Archive Format Converter

Convert between ZIP and uncompressed TAR archives.

New

File Preview Viewer

Preview images, text, PDF, audio and video files instantly, without uploading them anywhere.

PDF Tools

Merge, split, compress and convert PDF files.

Image Tools

Compress, resize, crop and convert images.

Link & QR Tools

Shorten links and generate QR codes and barcodes.

Audio Tools

Convert audio files and turn text into speech, or speech into text.

Video Tools

Compress and process video files, right in your browser.

Developer Tools

JSON, encoding, hashing and text utilities for developers.

SEO & Web Tools

Meta tags, sitemaps, schema markup and other on-page SEO utilities.

Data & Spreadsheet Tools

Clean, convert and inspect CSV, TSV and tabular data.

Business Tools

Invoices, quotations, receipts and other business documents.

Social Media Tools

Resize images for social platforms, count hashtags and preview posts.