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File Size Comparator

Compare the sizes of multiple files with our free online File Size Comparator. Upload several files at once and instantly see them visualized as a proportional bar chart - the largest file gets a full-width bar while others are scaled relative to it. The tool automatically identifies the largest and smallest files in your set, displays summary statistics (total, average, median sizes), and lets you sort by name or file size. Whether you're auditing storage, planning a migration, or just curious about which files are biggest, the visual bar chart makes size comparison effortless. All processing runs entirely in your browser - no uploads, no signup, completely free.

File Size Comparator

Upload multiple files to compare their sizes with a visual bar chart. Instantly identify the largest and smallest files, view detailed statistics, and sort by name or size. All processing runs locally in your browser - no uploads, no signup, completely free.

Drop files here or click to browse

Select multiple files to compare their sizes

About file size comparison: File sizes can vary dramatically depending on content, format, resolution, compression, and metadata. The visual bar chart scales all files proportionally to the largest file in your set, making it easy to see the relative size distribution at a glance. Use the sort controls to organize by name or size, and check the extreme file badges to identify your largest and smallest files instantly.

Features

Visual Bar Chart Comparison

Upload multiple files and instantly see their sizes compared on a proportional horizontal bar chart. Each file is represented as a color-coded bar scaled relative to the largest file, making it immediately obvious which files are biggest and smallest at a glance.

Largest & Smallest File Detection

Automatically identifies the largest and smallest files in your set with highlighted badges and summary statistics. Know instantly which files dominate your storage and which are the smallest - perfect for storage audits and cleanup decisions.

Batch Upload & Sorting

Drag and drop or select multiple files at once for batch comparison. Sort files by name or size with a single click. View detailed information for each file including extension, MIME type, and last modified date alongside the size visualization.

100% Browser-Based & Private

All file comparison runs entirely in your browser. Files are read using the File API and processed in-memory - no data is ever uploaded to any server. Your files never leave your device, making it safe to compare sensitive documents and proprietary data.

Use Cases

Storage Cleanup & Optimization

Identify the largest files taking up space on your device or server. Upload a batch of files and instantly see which ones are storage hogs. The file size comparator makes cleanup decisions easy by showing the size distribution at a glance.

Media Asset Management

Photographers, videographers, and designers can compare exported assets to ensure consistent output sizes. Quickly spot unexpectedly large or small exports that may indicate incorrect export settings or compression issues.

File Migration Planning

When planning to migrate files between storage systems, cloud providers, or backup solutions, compare file sizes to estimate transfer times and storage requirements. Identify files that may need optimization before migration.

Upload Size Compliance

Many platforms have file size limits. Use the file size comparator to quickly check which files exceed upload limits for email attachments, cloud storage, CMS uploads, or API endpoints before attempting to submit them.

Server & Directory Auditing

Audit directories and file shares for unusually large or small files. The visual comparison makes it easy to spot outliers - files significantly larger or smaller than their peers - without manually inspecting each file property.

Educational Size Comparison

Learn how file formats, resolution, and compression affect file sizes. Upload images, documents, and archives at different settings to see a visual comparison of how your choices impact the resulting file size.

About

What Is a File Size Comparator?

A file size comparator is a tool that allows you to upload multiple files and instantly compare their sizes using a visual bar chart. Each file is displayed as a horizontal bar proportional to its size relative to the largest file in the set. The tool automatically identifies the largest and smallest files, shows total and average sizes, and provides sortable columns for deeper analysis. Unlike manually inspecting file properties one by one, the file size comparator gives you an immediate visual overview of the entire size distribution in your file set.

How the Bar Chart Comparison Works

When you upload files, the tool reads each file's size property and scales all bars proportionally to the largest file, which always gets a full-width bar. Files smaller than the largest are rendered as shorter bars with their exact size label. Each bar is color-coded for easy visual scanning: the largest file is highlighted in red, the smallest in green, and middle-sized files in blue/indigo. The chart updates in real-time as files are added, and you can sort the list by file name or size to organize the comparison your way.

Key Metrics & Summary Statistics

Alongside the visual bar chart, the tool provides comprehensive summary statistics: total count of files, total combined size, average file size, median file size, and the size range (smallest to largest). Each file card displays the file name, exact size in both human-readable format and bytes, file extension, MIME type, and last modified date. The largest and smallest files are clearly marked with badges, making it easy to take action on the extreme values in your set.

Browser-Based Processing & Privacy

All file analysis runs entirely in your browser using the File API. Your files never leave your device - no uploads, no server requests, no third-party services. This makes the tool suitable for comparing sensitive files, confidential documents, proprietary data, and personal files without exposing them to any external network. When you close or refresh the page, all data is discarded.

Related Tools

File Size Anomaly Detector

Detect files whose size is unusual compared to typical files of the same type. Flags suspiciously small or large files for further inspection.

Zero Byte File Checker

Upload multiple files to check for zero-byte (empty) or unusually small files. Detects failed downloads, corrupt transfers, and incomplete data writes.

Image File Size Analyzer

See a detailed breakdown of what contributes to an image's file size - pixel data, compression overhead, metadata, and color profiles.

Truncated File Detector

Detect if a file has been truncated (cut short). Compares expected end-of-file marker with actual file size.

File Integrity Signature Checker

Verify that a file's magic bytes match its extension and check for header-level corruption.

Bulk File Type Detector

Upload multiple files to detect their true file types by reading magic bytes. Highlights extension mismatches.

FAQ
What is a file size comparator and how does it work?
A file size comparator is a tool that lets you upload multiple files and compare their sizes using an interactive visual bar chart. Each file is shown as a horizontal bar scaled proportionally to the largest file. The tool reads each file's size property directly from your browser's File API and renders the comparison instantly - no uploads, no server processing, just instant visual feedback on your file size distribution.
How are the bar chart bars scaled?
Bars are scaled proportionally to the largest file in your set. The largest file always gets a full-width bar (100%), and every other file's bar width is calculated as a percentage of the largest. This makes it immediately obvious which files are biggest and how much smaller each file is relative to the maximum. The exact percentage is shown next to each bar.
How many files can I compare at once?
You can upload as many files as your browser can handle. Each file is analyzed synchronously for instant results. There is no server-side limit since all processing happens locally in your browser. The tool displays summary statistics for any batch size and the bar chart updates dynamically as files are added or removed.
Is my data safe when using this file size comparator?
Absolutely. The file size comparator processes everything locally in your browser using the File API. Your files never leave your device - no uploads, no server requests, no third-party services. Only the file name, size, type, and last modified date are read for comparison, and all data is discarded when you close or refresh the page.
What information is shown for each file?
Each file in the comparison displays: the file name, exact size in both human-readable format (KB, MB, GB) and bytes, a color-coded horizontal bar proportional to the largest file, the percentage of the largest file's size, the file extension, MIME type, and last modified date. The largest file is highlighted with a red badge and the smallest with a green badge.
Can I sort the files?
Yes. You can sort the file list by file name (ascending/descending) or by file size (ascending/descending) with a single click on the sort buttons. The visual bar chart updates automatically to reflect the current sort order, making it easy to organize the comparison view the way you need.
What does the summary section show?
The summary section displays aggregate statistics for your file set: total number of files, total combined size, average file size (mean), median file size, size range (smallest to largest), and the names of the largest and smallest files with their sizes. This gives you a complete statistical overview without needing to calculate anything manually.
What file types are supported?
All file types are supported. The tool works with any file that your browser can access through the File API - images, documents, PDFs, spreadsheets, videos, audio files, archives, executables, source code, and any other file type. The tool shows the MIME type and extension for each file automatically.
Is this file size comparator completely free to use?
Yes - 100% free, forever. No signup, no account, no premium tier, no usage limits. Compare as many files as you need, as often as you need. All processing is done locally in your browser with zero server uploads.