FileDiffs vs ExamDiff: Which Should You Use?

ExamDiff Pro is the stronger choice for Windows users who need to merge files, compare entire folders, or wire a diff tool into version control. FileDiffs is the better fit if you want to compare files instantly in any browser — on Mac, Linux, a Chromebook, or a phone — without installing anything.

ExamDiff is Windows-only desktop software from PrestoSoft, with a free basic version and a paid Pro version starting at $34.99 per seat. FileDiffs is a free, browser-based tool that runs entirely on your own device and handles 60+ file formats. They solve the same problem — showing you exactly what changed between two files — but they're built for different platforms and different jobs. Pick by platform and task, not by brand.

FileDiffs vs ExamDiff at a glance

ExamDiff feature and pricing details are drawn from PrestoSoft's product and pricing pages; FileDiffs details from its product documentation.

What is ExamDiff (and ExamDiff Pro)?

ExamDiff is a long-running visual file comparison tool for Windows, made by PrestoSoft since the late 1990s. It loads two files side by side and color-highlights every addition, deletion, and change, with one-click re-comparison and drag-and-drop support. It's a desktop application — you download and install it, and it runs on your machine.

ExamDiff Pro is a powerful tool for a specific, well-defined audience: programmers, testers, technical writers, and IT staff who compare and reconcile file versions all day. PrestoSoft lists the latest stable build as 17.0.1.4, released June 20, 2026, so the product is actively maintained — not abandonware.

ExamDiff (free) vs ExamDiff Pro (paid): the actual difference

The free ExamDiff compares text files only. The paid ExamDiff Pro adds the features that make it a serious workhorse: directory (folder) comparison, binary and executable comparison, two- and three-way diff and merge, syntax highlighting, fuzzy line matching, command-line operation, and version-control integration.

PrestoSoft prices ExamDiff Pro at $34.99 per seat for the Standard edition and $49.99 for the Master edition, with upgrade licenses from $19.99 and a 20% educational discount. The license never expires, and a 30-day free trial is available. According to a PCWorld review of an earlier version, ExamDiff Pro can also convert Word, PowerPoint, and PDF files to text — and Excel files to CSV — so it can diff document formats through plugin conversion. (That review is from 2011; verify the current plugin list against PrestoSoft's documentation before relying on it.)

What is FileDiffs?

FileDiffs is a free, browser-based file comparison tool that runs entirely on your device. You open two files, and the comparison happens in your browser's memory — nothing is uploaded to a server. It supports 60+ file formats, including PDF, Word (DOCX), Excel (XLSX), CSV, JSON, XML, Markdown, dozens of programming languages, and niche formats like ICS calendars and .env config files.

FileDiffs is a comparison viewer, not a full diff-and-merge suite. It offers side-by-side, unified, and line-by-line views, and the free tier needs no install and no login. It does not merge files, compare folders, compare binaries, do three-way comparison, or integrate with the command line or version control. Paid Professional and Enterprise tiers exist for higher-volume use. (Confirm the exact tier pricing and feature gating on the FileDiffs pricing page.)

Which one should you choose?

Choose based on your platform and the kind of work you do, not on which name you've heard of. The two tools barely overlap once you get past "they both show file differences."

Choose ExamDiff Pro if…

• You're on Windows and compare files frequently as part of your job.
• You need to merge changes between versions, not just view them — especially two- or three-way merges.
• You compare entire folders or directories and synchronize them.
• You work with binary files or executables, or need byte-level comparison.
• You want the diff tool wired into version control (Git, SVN) or driven from the command line.

Choose FileDiffs if…

• You're on Mac, Linux, a Chromebook, or mobile, where ExamDiff won't install.
• You need a comparison right now and don't want to download software.
• You compare mixed document formats — a PDF against a Word doc, two spreadsheets, JSON payloads, or .env configuration files.
• Your comparisons are occasional and a paid desktop license isn't worth it.
• You want a clean, focused viewer without the learning curve of a feature-dense desktop app.

Platform and access: Windows desktop vs any browser

This is the single biggest difference. ExamDiff and ExamDiff Pro run only on Windows; there's no native Mac or Linux build. If you're not on Windows, ExamDiff isn't an option at all, no matter how good it is.

FileDiffs runs in any modern browser — Chrome, Firefox, Safari, or Edge — on any operating system, including phones and tablets. There's nothing to install and nothing to keep updated. For teams on mixed hardware, that removes a real friction point: everyone uses the same tool regardless of their machine.

The trade-off is depth. A mature desktop application can do things a browser tab can't easily match, which is exactly why ExamDiff Pro keeps merging, folder sync, and binary comparison in its column.

Pricing compared

ExamDiff's free version costs nothing but only handles text files. ExamDiff Pro is a one-time purchase — $34.99 per seat (Standard) or $49.99 (Master) per PrestoSoft's pricing page — with upgrade pricing from $19.99 and a license that doesn't expire. That's an inexpensive, durable cost for a tool used daily.

FileDiffs is free to use for side-by-side comparison across 60+ formats with no login, and it offers paid Professional and Enterprise tiers for heavier workflows. For occasional or cross-platform users, the free tier often covers the job without any spend. For a frequent Windows power user who needs merging and folders, ExamDiff Pro's modest one-time fee is usually the better economics. You can review the current plans on the FileDiffs pricing page.

Privacy and data handling

Both ExamDiff Pro and FileDiffs keep your files on your own machine — and that's an important point to get right. ExamDiff Pro is desktop software, so your data never leaves your computer. FileDiffs processes files client-side in the browser, so your files are read into local memory and never transmitted to a server. On privacy, the two are effectively equivalent.

The upload risk applies to a different category: server-based online diff tools that send your files to a remote server to process them. PrestoSoft's own online tool, DiffNow, is browser-accessible but works by uploading files to compare them, which is the model FileDiffs deliberately avoids. So FileDiffs' real privacy advantage is over other online tools, not over ExamDiff Pro on the desktop. If you handle confidential contracts, source code, or financial data, stick to local or client-side tools regardless of which one you pick.

How to compare two files in each tool

Both tools get you to a highlighted diff in well under a minute.

In ExamDiff Pro (desktop):

1. Open ExamDiff Pro and choose the Files option in the Compare dialog.
2. Specify the two files by typing the paths, picking from the recent-files dropdown, browsing, or dragging them from Windows Explorer.
3. Click Compare to see the side-by-side diff with changes color-coded.
4. Navigate differences with the Next/Previous buttons or hotkeys, and merge or edit in-pane if needed.

In FileDiffs (browser):

1. Open FileDiffs in any browser and select the comparison tool for your file type.
2. Load the original file into the first pane and the revised file into the second.
3. Run the comparison; every addition, deletion, and change is highlighted instantly.
4. Switch between side-by-side, unified, or line-by-line views to read the changes the way you prefer.

If your task is specifically comparing Word documents online or checking a PDF against a Word file, the browser route skips the install entirely.

Pros and cons

ExamDiff Pro — pros: deep feature set (merge, folders, binary, VCS, command line); fast and proven on large files; one-time license that never expires; actively maintained. ExamDiff Pro — cons: Windows-only; requires installation; paid for the useful features; more to learn.

FileDiffs — pros: free core tool; nothing to install; cross-platform on any device; 60+ formats including documents and data; client-side processing keeps files private. FileDiffs — cons: no merging; no folder or binary comparison; no command-line or version-control integration; newer tool with a shorter track record.

Common mistakes when choosing a diff tool

• Choosing by brand instead of platform. ExamDiff is excellent, but it can't run on a Mac or Chromebook. Match the tool to your operating system first.
• Assuming "online" means your files get uploaded. Client-side tools like FileDiffs process files locally; only server-based tools transmit them.
• Paying for features you'll never use — or picking a viewer when you need a merger. If you only ever eyeball changes, a free viewer is enough; if you reconcile versions, you need merge.
• Comparing rendered PDFs or Word docs visually. Layout shifts can hide real wording changes. Compare the extracted text layer, not the visual page.
• Ignoring encoding and line-ending differences. Unicode and CR/LF mismatches can make identical-looking files appear different until you enable the right ignore options.

Best practices for file comparison

• Match the tool to the task. Merging, folder sync, or VCS work points to a desktop tool like ExamDiff Pro; quick cross-format or cross-platform checks point to a browser tool like FileDiffs.
• Diff the content, not the formatting. For PDFs and Word files, compare the underlying text so formatting noise doesn't bury the real edits.
• Use ignore options for code and config. Ignoring whitespace, case, or blank lines cuts the noise when diffing source or configuration files.
• Keep sensitive files on local or client-side tools. Avoid server-upload diff services for confidential material.
• Pick the right view. Side-by-side is best for review; unified or line-by-line gives a compact change log. If you want a refresher on the mechanics, FileDiffs has a guide to how file comparison works.

Conclusion

ExamDiff and FileDiffs aren't really rivals so much as tools for different situations. ExamDiff Pro is the deeper, Windows-only desktop tool — choose it when you need to merge, compare folders, handle binaries, or plug into version control. FileDiffs is the free, install-free, cross-platform option — choose it when you need to compare files quickly on any device, across 60+ formats, without uploading anything.

The simplest rule: if your work lives in merging and folders on Windows, install ExamDiff Pro. If you just need to see what changed, anywhere, on any machine, open FileDiffs.