How do I choose the chunk size?

Set it based on whatever limit you're working around — an email attachment cap, an upload limit, or a transfer medium's capacity.

Do the chunks need to be reassembled with the same tool?

For guaranteed compatibility, use the matching File Joiner tool, which expects the same numbered-chunk format this tool produces.

Is any data lost when splitting a file?

No, splitting just divides the file's bytes into sequential pieces — reassembling them in order reconstructs the file exactly.

Does Large File Splitter upload my files to a server?

No. Large File Splitter runs entirely in your browser using on-device processing, your files never leave your device.

Large File Splitter

Split a large file into smaller numbered chunks for easier transfer.

Runs in your browser

Drop a file here

Choose File

Parts download as a .zip — use the File Joiner tool to reassemble them. Runs entirely in your browser.

About this tool

Upload limits, email attachment caps and storage quotas are usually expressed as a maximum file size, and a single large file — a video export, a big archive, a disk image — can exceed that limit even when the overall amount of data you need to send wouldn't otherwise be a problem. This tool splits a large file into smaller, numbered chunks small enough to fit under a size limit, letting you transfer it in pieces and reassemble it afterward.

Frequently asked questions

New

File Joiner

Reassemble a file that was split into numbered chunks back into the original.

File Size Converter

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

Zip & Unzip Files

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

File Type Detector

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

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.

Hex Viewer

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

File to Base64 Converter

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

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.

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.