Is the rest api rate limit sliding window or fixed time period? I’m trying to adjust my backend conc
Is the rest api rate limit sliding window or fixed time period? I’m trying to adjust my backend concurrency settings.
SIs it possible to make the /markdown api return both the original html and the extracted markdown? I'm building something that requires verifying results afterwards, which need a "snapshot" of original html dom (like wayback machine).
Kgreat q - will add to docs too
Rate limits are enforced with a fixed per second fill rate. For example, the workers paid limit of 60 requests per minute translates to 1 request per second. This means you cannot send all 60 requests at once; the API expects them to be spread evenly over the minute.
Rate limits are enforced with a fixed per second fill rate. For example, the workers paid limit of 60 requests per minute translates to 1 request per second. This means you cannot send all 60 requests at once; the API expects them to be spread evenly over the minute.
Kwe have a separate /content endpoint for html https://developers.cloudflare.com/browser-rendering/rest-api/content-endpoint/. any reason that doesn't work for you?
Cloudflare Docs
The /content endpoint instructs the browser to navigate to a website and capture the fully rendered HTML of a page, including the head section, after JavaScript execution. This is ideal for capturing content from JavaScript-heavy or interactive websites.
SI don’t want to make 2 request for a single scrape. I’m thinking that for /json or /markdown endpoint, the original content is already available, could have an option to just return both json/markdown and original content.
GHello, is it allowed to scrap for example Instagram for their OG meta properties or does it break the Cloudflare rules?
Ahow does one monitor the usage of the api? I only see how many requests its making to the api but not how much browser hours that consumed?
AI just saw "Currently, the Cloudflare dashboard displays usage metrics exclusively for the Workers Bindings method. Usage data for the REST API is not yet available in the dashboard. We are actively working on adding REST API usage metrics to the dashboard.". How do I monitor my usage somewhere else?
GCan anyone give me an answer to this question please :/
MHi there! Since I'm not getting an answer in the #workers-help thingy, am I in the right place here to report this bug? Or am I doing something wrong?
workers-and-pages-helpFonts look bad in Browser Rendering screenshots
workers-and-pages-helpFonts look bad in Browser Rendering screenshots
GDoes anyone use this api for retrieving the opengraph meta data of a website? Are there any configurations which I have to consider for best practice? Appreciate any help
KDepends on a site but usually you don't need browser rendering to fetch opengraph. Just do simple http call to fetch html.
GInstagram and Tiktok loads the opengraph dynamically
Khmm might be an unsupported font. let me get a list of fonts we currently support. do you know what font it is?
Kwhen using the rest api you can see the browser time used for every request in the
ah i need to update that in the docs. thanks for reminding
X-Browser-Ms-Used headerah i need to update that in the docs. thanks for reminding
MOne example is the google font Poppins
Kgot it, yea looks like it's not a supported font right now. would you be able to use one of the ones here instead? https://kathayl-patch-9.preview.developers.cloudflare.com/browser-rendering/reference/supported-fonts/
Cloudflare Docs
Browser Rendering uses a managed Chromium environment that includes a standard set of fonts. When you generate a screenshot or PDF, text is rendered using the fonts available in this environment.
JHey i was trying to use the Rest API enpoint /content to get client side rendered content from Algolias instantsearch. I tried everything but i didn't get any items.
Kwhat url/what was the request? what response did you get?
GHello, I want to generate url previews with opengraph meta tags but is using the browser rendering api the right approach for dynamic websites?
Dso can I say automate some clicks for online courses
Dsomething simple like everytime it autoplays to the next video I need to manually hit fullscreen
Dor is this more a case for workers?
ZBrowser rendering is for running a browser on the server, and from your question it looks like you more want to control a browser running on your own computer? If so, I'd recommend either looking into making a browser extension, or using selenium or puppeteer
II would recommend Selenium or Puppeteer if you're just getting started. They're easier to use.
Kwe've worked on it a bit for REST API! but not working 100% of time yet (still fixing bugs). are you needing it for REST API or workers bindings?
bc if REST API, it might work for you now
bc if REST API, it might work for you now
DAny insights into time out issue: Page.printToPDF timed out. Increase the 'protocolTimeout' setting in launch/connect calls for a higher timeout if needed.
I've set the protocolTimeout to 0 in my config:
const browser = await puppeteer.launch(env.BROWSER,{
headless: 'new',
keep_alive: 600000,
args: [
"--disable-setuid-sandbox",
"--no-sandbox",
"--single-process",
"--no-zygote",
],
protocolTimeout: 0,
});
Any other suggestions for avoiding timeout.
What my app does - I pass it an HTML string, which it renders via page.setContent(html...) then it converts to PDF using page.pdf({...,timeout: 0})
I've set the protocolTimeout to 0 in my config:
const browser = await puppeteer.launch(env.BROWSER,{
headless: 'new',
keep_alive: 600000,
args: [
"--disable-setuid-sandbox",
"--no-sandbox",
"--single-process",
"--no-zygote",
],
protocolTimeout: 0,
});
Any other suggestions for avoiding timeout.
What my app does - I pass it an HTML string, which it renders via page.setContent(html...) then it converts to PDF using page.pdf({...,timeout: 0})
DI switched to use the playwright provider instead of puppeteer and it loaded significantly faster with no time out, so will stick with that and likely not turn back to puppeteer
FHi, I'm curious why custom fonts are not supported? Is there a timeline for this? This is a big blocker for me unfortunately
KAs far as using those default supported fonts... i'm having trouble even rendering those..? Setting font-family to any of those isn't working? 
GHello, is it possible to waitUntil "networkidle2" in the rest api?
Kyep, add it like so:
{
"url": "https://open.spotify.com/artist/3c0gDdb9lhnHGFtP4prQpn",
"gotoOptions": {
"waitUntil": "networkidle2"
}
}
{
"url": "https://open.spotify.com/artist/3c0gDdb9lhnHGFtP4prQpn",
"gotoOptions": {
"waitUntil": "networkidle2"
}
}
GThank you! I will give it a try
GAlso, if I use the rest api, will be the origin my domain?
K
week announcements from browser rendering!1) Playwright support is GA
2) Stagehand support in Beta
3) higher limits so you can scale
read more + examples: https://developers.cloudflare.com/changelog/2025-09-25-br-playwright-ga-stagehand-limits/
blog: https://blog.cloudflare.com/cloudflare-developer-platform-keeps-getting-better-faster-and-more-powerful/#playwright-in-browser-rendering-is-now-ga
Cloudflare Docs
Browser Rendering birthday week announcements
The Cloudflare Blog
Cloudflare's deWe're making it easier for developers to build amazing things, by introducing major upgrades like external model support in AI Search (previously AutoRAG), updates to Node.js compatibility, support for larger and more concurrent container instances, and more! Plus, new tools like, transactional email, and GAed support for Workers...
XWould be great to have better observability, e.g. which workers caused browser rendering events in the logs. Just spent a long time trying to figure out why a worker was causing so many browser rendering hours, when it turns out it was a totally unsuspected one instead!
TWe're working on implementation of the rendering api for generating PDF files with the puppeteer provider. In evaluating this against our current solution I'm seeing that some of the custom fonts our customers use aren't supported (I've seen/reviewed the web page you guys have published for this). On that page you mention to come here to the discord to request new fonts to be supported. Before we start bombarding you with requests I wanted to get an idea for what that process and timeline looks like. For now we're going to encourage our customers to use supported fallback fonts in their CSS rules but if a particularly important customer feels strongly about something like Calibre or Open Sans - how likely is that to become supported and in what span of time?
DHey guys I noticed the browser rendering api is getting detected as a bot and would like to use my own custom implementation, is there a way I can connect to my own playwright instance through websockets?
DIs this available anywhere? I would like to do the same so I can use my own playwright server instead of the browser rendering api
DNope wont work cuz cloudflare workers has limitation on ws size message so even if you patch it cdp messages will be too big inside cloudflare workers see https://github.com/cloudflare/workerd/issues/4649
edit see someone else tried and wrote up way more about it:
https://github.com/cloudflare/playwright/pull/59
edit see someone else tried and wrote up way more about it:
https://github.com/cloudflare/playwright/pull/59
GitHub
I’m working on adding support to connecting to any arbitrary websocket chrome dev protocol server for @cloudflare/playwright (in draft cloudflare/playwright#59) but seeing errors when the incoming ...
GitHub
This adds support for using any ws CDP based server to connect to, without breaking existing usage of the browser rendering api. Example usage with Browserbase:
import { Browserbase } from &#39...
import { Browserbase } from &#39...
DThat’s too bad, guess I’ll stick with aws lambdas for now
J#browser-rendering-api
Koh so timely. actually just finished PR for docs to add info on how you can add your own fonts!
will be at the bottom of this page in ~10 min https://developers.cloudflare.com/browser-rendering/reference/supported-fonts/
will be at the bottom of this page in ~10 min https://developers.cloudflare.com/browser-rendering/reference/supported-fonts/
Cloudflare Docs
Browser Rendering uses a managed Chromium environment that includes a standard set of fonts. When you generate a screenshot or PDF, text is rendered using the fonts available in this environment.
WUnable to create new browser: code: 503
Got this error a few times yesterday
Got this error a few times yesterday
PPossibly related to https://www.cloudflarestatus.com/incidents/wvkqmzqz8f08.
There are still some reports of the error happening, which the team is currently taking a look at
There are still some reports of the error happening, which the team is currently taking a look at
WI've been periodically getting this error (invoking browser rendering via workers binding)
redacted
redacted
<uuid>K
when did it start happening? and had you made any changes?WGetting this a bunch right now - is there a known issue?
