CRX id
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Description from extension meta
Modify HTTP request headers, response headers, and redirect URLs
Image from store
Description from store
The most popular Chrome extension to modify headers and monitor page statistics simultaneously.
** What can ModHeader do?**
- Add, modify, and remove request and response headers
- Use ModHeader to set X-Forwarded-For, Authorization, Access-Control-Allow-Origin, Content-Security-Policy, and your custom headers!
- Modify cookies in request / response header
- Advanced Content-Security-Policy editor
- Redirect URL to another
- Enable header modification by URLs
- Advanced filtering by tab, tab group, or window
** Why ModHeader **
- ModHeader is fast, efficient, and light-weight. You can quickly enable/disable header modification with just 1-2 clicks.
- ModHeader provides you with many convenient features that will help you increase your development velocity with the least amount of frictions. Check out the big list the features below!
- ModHeader is free to use, with a paid option to unlock even more features.
- ModHeader works on Chrome, Firefox, Edge, and Opera.
- ModHeader is used by over 800,000+ users on Chrome Web Store!
** ModHeader features **
- Add comments to header
- One-click "undo" if you made a mistake
- Support having multiple profiles with quick switching between profiles
- Export and import profile
- Easily share your profiles with others
- Customize autocomplete names and values
- Support for dynamic variables
- Dark mode support
- Sorting headers and name, value, or comments
- Append value to existing request or response header
- Customizable profile badge
- Clone profile
- Cloud backup
...and more!!!
** What is new in 5.0.1 **
- Make more features available to free users
- Fix bugs
** What is new in 4.4.1 **
- Change buttons to use camel cases instead of upper cases
- Improve default auto-sync profile
- Add close banner ad options
** What is new in 4.4.0 **
- Enable ad-supported plan where users can get pro for allowing affiliated ads in extension. Users can opt-out of ads by selecting ... -> Opt out of ads (will revert back to having limited profiles and rules).
** What is new in 4.3.8 **
- Link to header help article on known standard headers
** What is new in 4.3.7 **
- Support iso_date and utc_date variable
** What is new in 4.3.6 **
- Suggest when advanced header editor is available
- Suggest when a response header is incorrectly entered in request header field and vice versa
- Suggest using tab domain filter, tab group filter, window filter, etc.
** What is new in 4.3.5 **
- Revise the add dialog to give more description
** What is new in 4.3.4 **
- Improve export dialog
- Support creating embedded ModHeader button
** What is new in 4.3.2 **
- Support query parameter as dynamic value
- Support matching HTTP methods in request URL filter and exclude request URL filter
** What is new in 4.3.1 **
- Make import with auto-sync available for free
- Gather feedbacks on uninstallation
** What is new in 4.3.0 **
- Allow free users access to all mods and filters, but limit number of rules to 10.
** What is new in 4.2.10 **
- Internal refactorings
** What is new in 4.2.4 **
- Fix a minor bug with time filters
** What is new in 4.2.3 **
- Fix a minor bug with tab domain filters
** What is new in 4.2.2 **
- Introduce tab domain filters
- Show pro icon next to pro features
- Disable pro items when user is no longer using Pro
** What is new in 4.1.6 **
- Allow start trial without credit card
** What is new in 4.1.5 **
- Control sharing visibility within ModHeader
** What is new in 4.1.4 **
- Make it easier to add
- Show profile picture when available
** What is new in 4.1.3 **
- Fix dark mode
** What is new in 4.1.0 **
- Update login, logout, and license checking logics
** What is new in 4.0.21 **
- Add support for advanced Content-Security-Policy modification
** What is new in 4.0.20 **
- Fix ModHeader not showing up for new users.
- Add {{ip_v4}} dynamic value
** What is new in 4.0.19 **
- Show tutorial to new users
** What is new in 4.0.18 **
- Support for simple dynamic value: {{uuid}}, {{url}}, {{url_origin}}, {{url_hostname}}, {{url_path}}, {{existing_value}}, {{timestamp}}
** What is new in 4.0.17 **
- Allow ModHeader to read from managed storage (for enterprise)
- Fix CSS not loading correctly
** What is new in 4.0.16 **
- Add regex cookie matching and ability to retain cookie value while modifying its attributes
** What is new in 4.0.15 **
- Add support for Time filter
** What is new in 4.0.14 **
- Dependency upgrades and some minor bug fixes
** What is new in 4.0.12 **
- Support auto-sync profile import: https://docs.modheader.com/profiles/auto-sync-profile
- Remove support for dynamic value as Firefox addon policy and Manifest V3 both disallow it. If you need this feature, please email [email protected] and we will try to figure out how to support your use-case.
** What is new in 4.0.10 **
- Profile search support
- Auto expand left panel on tab view
** What is new in 4.0.9 **
- Minor UI updates
** What is new in 4.0.8 **
- Support reordering profile, headers, and filters.
** What is new in 4.0.7 **
- Fix profile switching not working
** What is new in 4.0.6 **
- Add link to create login URL to quickly login to additional browser / browser profile.
** What is new in 4.0.4 **
- Fix crash due to tabs not found
- Fix ModHeader not working on older browser
** What is new in 4.0.0 **
- Support enhanced cookie modification
- Replace tab lock with tab filter, along with tab group and window filter
- Support autocomplete customization
- Dark mode support
- Keyboard commands mapping
- Give users more controls over share profile URLs
- Paid subscription required for some of the newly introduced features. Most existing features should continue to work for free users.
** Older changelogs **
https://docs.modheader.com/whats-new/version-4.x
** Permissions **
ModHeader currently requires 6 permissions:
1, "webRequest"
2, "webRequestBlocking"
3, "<all_urls>"
4, "storage"
5, "contextMenus"
6, "alarm"
"webRequest" and "webRequestBlocking" are required in order for request headers modification to work. Because ModHeader doesn't know ahead of time which website the modification should apply to, it needs to request permissions for all URLs (3). "storage" permission is needed to save settings to the cloud. "contextMenus" is used to enable quick pause/unpause by right-clicking on the icon. "alarm" is used to periodically auto-sync profiles (if auto-sync is setup).
** User guide **
https://docs.modheader.com/
** Privacy Policy **
https://modheader.com/privacy
** Automation **
For Selenium WebDriver users, please try:
https://github.com/modheader/modheader_selenium
To find ModHeader on other browsers, visit modheader.com
Latest reviews
- (2025-06-12) Claude Brown: Cannot fault it - works brilliantly.
- (2025-06-11) Xavier Xi: TEST
- (2025-05-29) David Lubertozzi: Works well for me. My only complaint is that it only allows you one character for the profile badges. I'm using it for country IP spoofing, so it would be great to have two characters here, then you could name them using the ISO country codes.
- (2025-05-12) cirel ramos: it's really nice and helpful
- (2025-04-29) Alex Xu: Recently, this extension has been causing me performance issues on Chrome. Mostly stuttering and freezing. Removing the extension made the issues go away. Unfortunate as I'd been using it for about a year without issue before this. Will probably have to look for a simpler alternative.
- (2025-04-22) Sayad IKA: It's really simple to use and lightweight. Recommended if you want to get started as quick as possible.
- (2025-04-12) JJ Yang: Gives more direct feedback from custom headers than curl
- (2025-02-03) Asman Umbetov: Putting ads injecting aside (I haven't forget nor have I forgiven) I started experiencing weird performance issues with this extension. Right now it straight up doesn't open and i don't even know what can I do about it.
- (2025-01-29) J. Jones: Sold out to MaxAI! At one point was injecting ads into pages (definitely out of scope for ModHeader). They may have stopped since I noticed this behavior, but as long as they're partnered with MaxAI I can't trust them and I'd recommend you not trust them either! Looking into Requestly for similar functionality (and some Postman functionality to boot). Don't have a verdict on it yet but it's open source (search github for "requestly") so that certainly bodes better than this MaxAI "partnership"!
- (2025-01-27) Matin Tahani: This is a simple and powerful Extension!
- (2025-01-13) Etinosa Obaseki: Easy to use for my simple use case.
- (2024-12-20) Rory McCrossan: Attempted to use this to test Accept-Language but it just outright did not work. Ended up having to do it the long way, changing language via Chrome settings every time I wanted to test. Don't bother with this extension.
- (2024-12-10) Paul DEGRAEVE: Very practical. I love it !
- (2024-11-29) Ravi Tandon: Great product! Keep up the great work.
- (2024-11-27) Manish Singh: Is it stopped working with the automated browser in latest chrome version / driver? Its not working for me.
- (2024-11-19) Marius Andreiana: Works!
- (2024-11-13) Anton Antonov: Amazing plugin - does exactly what is it meant to do - modify the HTTP request's headers.
- (2024-11-01) Mac Ta: As a first time user, are there any tutorials? This is all so alien to me and the lack of application tutorials on the site, or on the web isnt helping either.
- (2024-10-29) Nic Davidson: Absolutely covered in pop in AI ads! Mod Header is ruined.
- (2024-10-20) CN MOON (情空明月): pop an ai ads,it's annoying,
- (2024-10-16) Konstantin Ignatyev: Good idea, but ModHeader is buggy - I wasted a lot of time before I realized that despite showing new headers it was NOT preventing Chrome browser from seeing and using old headers. In particular I have modified Etag from weak to strong, cleared cache, saw that on first request response headers were as I set them and asset was downloaded - however on subsequent uses of the asset Chrome was making 'check' request with using old weak Etag W/"xxx" Does not have a public support forum and bug database
- (2024-10-02) Francesco Laffi: useful but with invasive ads of maxai
- (2024-09-15) Devin Johnson: Amazing!
- (2024-08-26) Nelito Junior: I don't see the ads people mentioned, maybe because I have uBlock origin, not sure. But it worked and solved my issue, as I needed to test different Cache-Control headers.
- (2024-08-14) Akmal Dirgantara: popup ads
- (2024-07-22) Gonzalo Montero (Monti): Malware
- (2024-06-27) Marco G: Virus. Contacts Baidu, a Chinese company, every time you open a page.
- (2024-06-20) Cristian Chivriga: Malware
- (2024-06-18) Persoana Temp: The MaxAI Tab opens without any prior reference. Disappointing.
- (2024-06-17) Gregor D: Opens MaxAI Tab just out of nowhere without any reference to this extension..
- (2024-06-13) Jimmy Kultima: Steals focus by opening an ad. Will look for other options, this will be uninstalled regardless if I find a better one or not - it's not worth it.
- (2024-06-13) Kirin Yato: 🙅 "ModHeader has been updated" ✔️ "I'm earning ad money again."
- (2024-06-12) Paul Davidson: Randomly opening MaxAI.me website
- (2024-06-12) Nigel Hill: Used to be okay, now it keeps opening its own page randomly to promote something
- (2024-06-06) daguang tang: You can add Request headers without replacing the interface request headers
- (2024-06-04) Blue Barry: Last update broke filter rules
- (2024-05-30) Nikesh Yadav: Last update broke things so you can only have 2 or less request url filters, please fix it!
- (2024-05-30) 曾志杰: There are many functions that I don't need, and each page has a floating ball. I don't care about the memory occupation of the page at all. That's a developer's business
- (2024-05-29) Kayi Shum: Breaks JIRA
- (2024-05-29) 陈士力: COOKIE! I need COOKIE!
- (2024-05-28) Zack Zuzelo: Would give them 0 if possible, they open ads on chrome without my permission
- (2024-05-28) Mark Davidson: Last updated broke everything. Please fix it.
- (2024-05-28) Tom Winser: Used to be great, now is bloatware and latest update broke GitHub loading for me. Uninstalled
- (2024-05-28) Joachim Lous: Has really gone down hill. Ads are one thing, but messing up page loading even with no rules or when paused? Pure garbage.
- (2024-05-27) Isaque Hollanda Gonçalves: It worked well for inserting JWT into request tests. UI and usability could improve...
- (2024-05-27) JC Ge: after update to v7.0.1,i get error Error: Rule with id 1 was skipped as the "regexFilter" value exceeded the 2KB memory limit when compiled. this cause all my users panic in work. what should i do
- (2024-05-14) Reelix: Used to be great - Now it causes some web applications to stop working even when in "Paused" mode (Said applications start working as soon as the addon is disabled)
- (2024-04-29) Victoria Smedley: Opened up an ad tab in my browser on update, uninstalled
- (2024-04-27) Leo Valente: i just want to change headers and nothing more
- (2024-04-25) Kevin Smith: it was worth 5 until it was sold to someone else. now just ads all over, shifting to requestly forever.