curl vs wget: Which Command-Line Tool Should You Use?
curl vs wget compared — API calls vs file downloads, flag differences, and when each command-line tool is actually the right one.
Try it now: cURL to JavaScript Fetch Converter — Paste a cURL command and get clean fetch() code with headers, body, auth and method preserved. Nothing is sent to a server.
They Solve Different Default Problems
curl vs wget looks like a rivalry because both ship in the same package repositories and both take a URL on the command line, but they were built for different primary jobs. wget was built to download files and mirror entire websites — point it at a URL and walk away, the file lands on disk. curl was built as a general-purpose data-transfer tool for talking to servers over any protocol — point it at a URL and it prints back what the server sent, because inspecting and scripting the exchange is the actual job it was designed around. Neither default is wrong; they just optimize for different people doing different things.
That single difference in assumed intent explains almost every other difference between them, including the one that trips people up first: what happens when you don't pass any flags at all.
The Default-Behavior Difference, Shown in Code
Run wgetagainst a URL with zero flags and it saves the response to a file named after the URL's last path segment. Run curlagainst the same URL with zero flags and it prints the response body straight to your terminal — nothing is written to disk unless you tell it to write to disk. This is the single most common source of “curl download file” confusion: curl didn't fail to save the file, it did exactly what it was designed to do by default.
# wget: saves to disk by default, no flags needed wget https://example.com/release.tar.gz # → release.tar.gz written to the current directory # curl: prints the response body to stdout by default curl https://example.com/release.tar.gz # → binary/text dumped to your terminal # curl needs an explicit flag to behave like wget just did curl -O https://example.com/release.tar.gz # save using the remote filename curl -o out.tar.gz https://example.com/release.tar.gz # save under a chosen name
That's not a missing feature in curl — it's the same design decision that makes curl useful for things wget was never meant to do, like piping a response straight into jq, a shell script, or another command without an intermediate file ever touching disk.
curl vs Wget: Side-by-Side
The table below is the fastest way to answer curl vs wget which to use for a given task.
| Axis | curl | wget |
|---|---|---|
| Primary use case | Transferring and inspecting data over any protocol; scripting HTTP interactions | Downloading files and mirroring whole websites |
| Recursive download / site mirroring | No direct equivalent | Yes — wget -r walks links and downloads an entire site tree |
| Protocol support breadth | HTTP/HTTPS, FTP, SFTP, SMTP, and dozens more via one consistent interface | Effectively HTTP/HTTPS and FTP |
| Default output behavior | Prints response to stdout; needs -o/-O to save a file | Saves the response to a file by default; no flags needed |
| Scripting / API-testing ergonomics | Designed for it — headers, methods, auth, and body are all first-class flags | Workable for simple GETs; awkward for anything beyond a download |
Why curl Became the Standard for APIs
curl's protocol breadth is one reason it ended up embedded in scripts and referenced constantly in API documentation, but the bigger reason is that curl's entire flag surface is built around describing an HTTP request precisely: method, headers, auth, request body, and how to handle the response are all explicit, composable flags rather than defaults you have to work around. That's why “copy as cURL” became a universal convention in browser dev tools and API clients — a curl command is a complete, portable, copy-pasteable description of one HTTP interaction. wget can issue a GET request too, but it wasn't built around describing arbitrary request/response pairs, so it isn't what tooling reaches for when the goal is documenting or replaying an API call.
That's also exactly the gap GenKitLab's curl-to-fetch converter is built around: you paste a curl command copied from a browser or from documentation and get back working JavaScript fetch code, because that curl command was already the precise, portable description of the request — it just needed translating into application code. The full set of conversions, including Python and Node, is covered in the curl-to-code converter guide.
The Decision Framework
Reach for wgetwhen the job is “download this file, or mirror this site, and get out of the way” — a release tarball, a batch of images, an entire documentation site pulled down for offline reading. Its recursive mode and default-to-disk behavior exist specifically for that job and do it with less typing than curl requires.
Reach for curlwhen the job is “interact with an API, inspect response headers, script a multi-step HTTP interaction, or turn a request into application code.” If you find yourself adding -H for headers, -X for a method, or -dfor a request body, you've already left wget's comfort zone and landed in curl's. As a wget alternative for anything beyond a plain download, curl is the practical answer almost every time — and it's the tool the rest of the API tooling ecosystem, including GenKitLab's converters, is built to speak.
Frequently asked questions
›curl vs wget — which should I use?
Use wget when the job is downloading a file or mirroring a whole site — it saves to disk by default and has recursive mirroring built in. Use curl for anything involving APIs: setting headers, choosing an HTTP method, sending a request body, inspecting the response, or scripting a multi-step interaction.
›Why does curl print to the terminal instead of saving a file?
Because curl's default assumption is that you want to see or pipe the response, not necessarily save it — it was built as a general data-transfer and inspection tool. Use -O to save under the remote filename or -o to choose your own filename.
›Can wget do what curl does for APIs?
Only in a limited way. wget can issue a basic GET request, but it wasn't designed around setting arbitrary headers, methods, and bodies the way curl was, so it's rarely used for API testing or scripting HTTP interactions in practice.
›Can curl mirror a whole website like wget -r does?
Not directly — curl has no built-in recursive-crawl mode that follows links across a site the way wget -r does. For downloading a single known file or a fixed set of URLs curl works fine; for walking and mirroring an entire site's link structure, wget is the tool built for that.
›Is curl or wget faster for downloading a single large file?
In practice they perform similarly for a single file transfer since both use the same underlying protocol handling. The difference that matters is convenience: wget writes to disk with zero flags, while curl needs -O or -o to do the same thing.
›Why is curl the standard in API documentation instead of wget?
Because a curl command can fully describe one HTTP request — method, headers, auth, and body — in a single portable line, which is why browser dev tools and API clients standardized on "copy as cURL." wget wasn't designed around describing arbitrary request/response pairs, so tooling doesn't default to it for that purpose.
›What's a good wget alternative if I need more than a simple download?
curl. The moment a task needs a custom header, a non-GET method, a request body, or authentication beyond a basic username/password, curl's flag set covers it directly, and tools like curl-to-fetch can turn that same curl command into working application code afterward.
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