Is there a character limit on custom code in Webflow?

Yes. According to Webflow's help center, a Code Embed element holds up to 50,000 characters, and so does each head and footer code section at site and page level. Anything longer gets hosted as a separate file and loaded with a script tag, or split across several embeds. Webflow runs HTML, CSS, and JavaScript in the browser, so server-side languages like PHP, Python, and Ruby are out.

Can you add custom code to CMS collection items?

Yes. Scripts and markup can be driven by collection fields, so a single template renders the same functionality across an entire collection. That is how a schema block, a tracking parameter, or an embedded widget stays correct on every item without anyone touching the template again. It is also the part that has to be documented, because an editor will eventually change a field name.

Will custom code slow down my Webflow site?

Badly placed code will. A blocking script in the site-wide head field runs on every page, including the ones that never use it. We load what a page needs on that page, give the rest a defer attribute, and check the result against your Core Web Vitals. Reviewing the performance of existing scripts is a service on its own here.

What happens to our custom code when the site is redesigned or republished?

Code written against hooks we add for the purpose, such as custom attributes, keeps working. Code that depends on a class name or an auto-generated element ID breaks the first time a designer renames or rebuilds something. We write against those attributes, test on a staging URL before every publish, and hand you a record of what each script depends on. A redesign then starts from that record.

Can you work with code a previous developer left behind?

Yes. We inventory every custom script on the site, record what it does and where it loads, remove what is dead, and rewrite whatever conflicts. Old jQuery plugins often turn up. You get the map at the end. A small audit is a good first step before anything larger.

What does a custom code project cost?

Three models. One-time work starts at $60/hour, which fits a single script or a one-off fix. Hourly packages start at $900/month and suit a steady stream of small requests. Monthly retainers start at $3,000/month for a site under continuous development. Every task gets an estimate in hours before the work starts.

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Webflow Development

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Custom Code

Webflow Custom Code Built to Survive Your Next Publish

The thing your site has to do isn't in the Designer. A launch waiting on one interaction, an integration marketing already promised, an animation the brand needs, a script a contractor left behind that nobody dares open. We write it, document where it lives, and keep it working when the site changes.

Get my task estimated

See our work

Trusted by 50+ B2B marketing teams across 25+ countries.

450+

CMS items migrated from WordPress to Webflow

see case study

+94%

Event registrations after the conference site redesign.

see case study

$50M+

Revenue tier of clients they attract.

see case study

2 weeks

PDF of ideas to live sales tool.

see case study

+20%

Organic traffic growth after migration.

see case study

EU-wide

Lead generation reach after B2B website launch.

see case study

+300%

Organic search traffic increase after redesign.

see case study

50%

Increase in qualified leads post-launch.

see case study

2x

Organic traffic increase after redesign.

see case study

4 weeks

Full website developed and launched twice over.

see case study

2x

ICP conversion increased.

see case study

5 weeks

Full website with SEO strategy delivered.

see case study

2-3 month

Full redesign, migration, and SEO delivered.

see case study

35%

Lead-to-client conversion rate from website.

see case study

50+

Enterprise clients signed from the website

see case study

75+

Blog articles migrated without a single loss.

see case study

1+year

Ongoing retainer after initial launch.

see case study

100%

URL coverage across both merged domains.

see case study

450+

CMS items migrated from WordPress to Webflow

see case study

+94%

Event registrations after the conference site redesign.

see case study

$50M+

Revenue tier of clients they attract.

see case study

2 weeks

PDF of ideas to live sales tool.

see case study

+20%

Organic traffic growth after migration.

see case study

EU-wide

Lead generation reach after B2B website launch.

see case study

+300%

Organic search traffic increase after redesign.

see case study

50%

Increase in qualified leads post-launch.

see case study

2x

Organic traffic increase after redesign.

see case study

4 weeks

Full website developed and launched twice over.

see case study

2x

ICP conversion increased.

see case study

5 weeks

Full website with SEO strategy delivered.

see case study

2-3 month

Full redesign, migration, and SEO delivered.

see case study

35%

Lead-to-client conversion rate from website.

see case study

50+

Enterprise clients signed from the website

see case study

75+

Blog articles migrated without a single loss.

see case study

1+year

Ongoing retainer after initial launch.

see case study

100%

URL coverage across both merged domains.

see case study

Custom Code

WHO WE ARE

Foursets writes the Webflow custom code for features the Designer has no setting for. Our in-house team covers design, development, and SEO, and we have built on Webflow since 2021. For Nectar Edge we hand-coded the ROI calculator in vanilla JavaScript, because Webflow can't ship it natively, and their site went live in under two weeks.

Marketing comes to us with a launch date and one piece of the page the Webflow Designer can't build. The ticket goes to engineering, engineering is busy with the product, and the launch slips.

The same senior team takes that task and stays on your site from the first task to the hundredth.

PROBLEMS > SOLUTION

Common Problems, Uncommon Webflow Custom Code Solutions

The five situations we see most on Webflow sites that carry custom code.

Challenge

The feature the business needs isn't in the Designer, so the roadmap item sits open with nobody assigned to it.

Somebody pasted code snippets from a forum thread. They half work, and nobody knows what else they touch.

The site has collected custom scripts from three different contractors, none of them documented, and everyone is now afraid to change anything.

Marketing can't ship a landing page, because the one interaction it needs has to go through an engineering team busy with the product.

A republish or a redesign silently breaks a script, and the team hears about it from a customer.

Our Solution

We scope the task in hours, build it on staging, and ship it as Webflow custom code your team can keep. The roadmap item gets an owner and a date.

We read what is already running, find the conflict, and rewrite the piece that breaks. Then we log what it hooks onto, so the next person isn't guessing.

Script audit first. We record every script, the pages it loads on, and what it depends on. Dead code comes out, the rest gets a written record.

The task comes to us instead. One owner, an estimate in hours, and a live URL for a task that never entered your product sprint queue.

Every script gets tested on a staging URL before the publish that would have broken it, and the documentation lists what each one depends on. Your team sees the break on the staging URL first.

WEBFLOW EXPERT & PARTNER

Webflow experts, Premium Partners, and template authors, all in one shop

Foursets holds three Webflow credentials: certified Webflow experts since 2019, official Webflow template authors, and a Webflow partner at the Premium tier, the highest level in Webflow's partner program outside of Enterprise. On a mission to become a Webflow Enterprise Partner.

Vetted Webflow expertise

Webflow reviewed our work independently and certified that it meets their standards.

Priority support

When a deadline runs into a Webflow edge case, we reach their partner team directly.

Platform depth

CMS architecture, the site and page code fields, the Data API, Editor workflows, and Webflow Enterprise. We work at every layer, including the ones the visual builder has no panel for.

Our Services

What we build with code

Everything below is built by our in-house team.

(1/12)

Custom JavaScript & Interactions

Behavior you can't build in the Designer: conditional logic, calculators, gated content, multi-step flows. Plain JavaScript, tested on staging.

(2/12)

Animations Beyond Native

GSAP, scroll-driven and cursor-led work for the moments where native Webflow interactions stop being enough, tuned so the page still loads fast.

(3/12)

Webflow Custom Code Integration

We connect your site to the tools the business already runs, through embed code on the page, the site and page code fields, or the Data API.

(4/12)

Custom CSS & Design System Fixes

Print styles, focus states, container queries, and CSS variables, written by hand where the Designer's style panel stops.

(5/12)

Code in the CMS

Per-item scripts and custom HTML driven by collection fields, so one template renders every item in the collection without a manual edit per item.

(6/12)

Analytics & Tracking Implementation

Tag Manager containers, event tracking that matches your funnel, and consent handling that stays compliant without breaking your tracking.

(7/12)

Forms & Custom Endpoints

Validation, conditional fields, and submissions posted straight into your CRM, which saves your ops team the manual re-entry.

(8/12)

Third-Party Widget Embedding

Booking tools, chat, review widgets, and product embeds, placed so they load cleanly and keep your layout intact.

(9/12)

Structured Data & Schema Markup

Organization, Article, FAQPage, and Product markup, written by hand and validated before it ships.

(10/12)

Script Audit & Cleanup

We inventory every script on the site, record what each one does, flag the dead code, and hand you the map.

(11/12)

Performance Review of Existing Code

Where your scripts block rendering, what loads twice, and which third-party tag makes the user wait longest on mobile.

(12/12)

Ongoing Support & Documentation

A retainer for the steady stream of small requests, with every new script commented and the documentation updated when it ships.

Case Studies

Don't take our word for it, look at the results.

Six B2B projects where the Webflow build needed custom work behind the pages. Each case page shows what we did and what changed for the client.

From PDF to a live, interactive ROI calculator in under 2 weeks.

Nectar Edge builds infrastructure that runs complex AI models with sub-20ms latency, 30x cheaper than cloud. Two weeks before the Edge Agent Challenge event (NVIDIA and Intel in attendance), their primary sales asset was still a PDF. They needed a website that would convince skeptical AI developers and VCs. We shipped one, with a custom JavaScript ROI calculator as the centerpiece, on time for the event.

Watch case study

2 years. 3 CMOs. One Webflow partner.

CIM is an Australian B2B SaaS company building AI-powered software for high-performance commercial real estate. They came to us with an unmaintainable Webflow build after their in-house specialist left. Two years later, we've shipped through three CMO transitions, doubled their mobile PageSpeed, and built a CMS component library that lets every new marketing leader move fast on day one. Same team. Same site. Same partner.

Watch case study

An enterprise IT firm dragged off 8-year-old WordPress, with 450+ CMS items moved by hand.

SDI Presence runs turnkey IT for enterprise clients and U.S. government agencies. Think the California Highway Patrol and the Chicago Bears. Their website did not reflect that. It was an 8-year-old WordPress build with 250+ pages, 450+ CMS items in inconsistent formats, and a plugin update roulette that broke something every time. We rebuilt the whole thing on Webflow in six months, then handed their marketing team the blueprints.

Watch case study

Three conference websites in two years, and event registrations up 94%.

Element451 is an AI-powered enrollment platform for higher education. Their annual Engage conference brings 1,000+ attendees from institutions around the world, and the website has to be ready before the doors open. We started by patching the existing site in 2025, came back to rebuild it from the ground up in under a month, then redesigned it completely in 2026 on their updated brand identity. Registrations went from 518 to 1,006.

Watch case study

From 3 MQLs a month to 150, and 500% organic traffic growth.

Penti sells AI-powered pentesting to SaaS companies that need to clear enterprise security reviews fast. They came to us for a new Webflow site, and we found more underneath it: a brand that couldn't decide what it was, and a security architecture blocking their own analytics and SEO. We rebranded them, redesigned the site, and migrated off WordPress in under four weeks. Then we spent 18 months building the SEO engine that took them from 3 MQLs a month to 150.

Watch case study

20+ uniquely designed pages, a full SEO rebuild, and 14 months as their whole website department.

Dune Security trains employees not to click the shady link, turning staff from a liability into a human firewall. In May 2025 we took their website over from the agency that built it and inherited a half-documented Webflow and Figma setup. Fourteen months later we run their design, their Webflow development, their SEO, and the steady stream of graphics their marketing team ships every week.

Watch case study

Explore all case studies

22

Pricing

Deep expertise with simple, transparent pricing

One-time engagement

Fixed scope, fixed price

A full website redesign, migration, or SEO audit with everything defined upfront

No surprises on the invoice

Starting from

$60/hour

Scope my task

Hourly packages

Prepaid hours valid for a month, quarter, or year

Use them when you need them

Starting from

$900/month

Browse packages

Monthly retainers

A dedicated design and development, or SEO team embedded in your Slack

Month-to-month, no lock-in contracts

Starting from

$3,000/month

See retainers

webflow integrations

Your existing stack stays intact

Webflow doesn't replace your tools. It connects to them. We wire every new site to the platforms your team already runs, so your data flows cleanly from day one and nothing breaks at launch.

Still waiting on one piece of code?

Nick Rybak

Founder & CEO

Send us the script that worries you or the feature that's stuck. You get a free code review: what already runs on the site, what conflicts with the task, and an estimate in hours for the fix.

Get a free code review

Nick Rybak

Founder & CEO

Advantages

Why Choose Foursets

We replaced the standard agency "trust me, bro" model with radical transparency and zero hidden risks.

A live URL in 48 hours on average

Retainer clients drop a code task in Slack or ClickUp and see it live in 48 hours on average. The five-day process below is for a first task.

Every script we ship is documented

Where it lives, what it hooks onto, and what breaks it. The next person to open the site can find it, whether that person is us or your developer.

Designers and developers in one team

The code gets written against the real build. The designer and the developer work in the same channel, so the interaction ships the way the design shows it.

We work inside Webflow's constraints

We hook code onto custom attributes we add on purpose, and those survive a republish. Each one is listed in the documentation, so the designer on a redesign knows what to keep.

Radical transparency from day one

Shared Slack channel and ClickUp board from kickoff, and a staging link from the first line of code. You watch the code get written, ticket by ticket.

Full-time developers hold your keys

Your Designer access, your API keys, and your codebase stay with the people named on your project.

PROCESS

From a blocked task to a documented fix

Your estimate lists which of these steps the task needs, before anyone writes code.

DAY 1

Discovery call, scope, and contract

You speak to Nick Rybak, our founder, directly. He asks what the task has to do and what already broke. The same day you get the hours, the approach, and a contract to sign.

DAY 2

Kickoff and access

A shared Slack channel and a ClickUp board go up. You hand over Designer access or a read-only preview link, whichever your security policy allows.

DAY 3

Audit, then build on staging

First we inventory what is already running on the site and flag whatever conflicts with the task. Then the new code gets written and tested on the staging URL. The ticket moves on the board while you watch.

DAY 4

Test and review

A staging URL, on real devices. You click through it, we fix what you flag, and every flagged ticket closes before publish.

DAY 5

Publish and documentation handover

The code goes live on your site. You also receive the record of it: every script, where it sits, what it hooks onto, and what will break it later.

Ongoing. Support

New requests run through an hourly package or a retainer. Your team stays in the same Slack channel, and the documentation stays current.

INDUSTRIES

B2B companies we know inside out

We've built and grown websites for B2B teams at every stage and across every vertical. Real projects, real clients, not capability claims.

By company size:

Startups

First websites and full rebuilds for founders who need to look credible before the revenue proves it.

Scaleups

Companies past product-market fit that need the website to keep pace with an accelerating GTM.

Enterprise

Large organizations with security requirements, approval workflows and multiple stakeholders. SSO, audit logs and IT sign-off, without slowing marketing down.

By industry:

SaaS

Growth websites for SaaS teams that move fast and need a CMS they can create and manage themselves.

Cybersecurity

Compliance platforms and pentest vendors who need credibility fast. BD Emerson, Astro, Dune Security and Penti all sit in this vertical.

Agencies

Marketing, creative and consulting firms who need a website as sharp as the work they sell.

Fintech

Regulated companies where design trust signals and technical foundations win deals before the demo.

E-Commerce

Custom Webflow and Shopify builds for B2B and DTC brands that outgrew a template.

Healthcare

HIPAA-aware builds for health tech companies selling into enterprise procurement.

Education

EdTech products and institutions that need flexible collections, event systems and fast publishing.

Tech Companies

Technical teams whose site has to match the sophistication of the product behind it.

Venture Capital

Portfolio and fund websites that project authority to LPs, founders and the press.

Construction

Companies selling software, platforms and services into the construction industry.

Conferences

Event sites with speaker listings, agenda systems and third-party registration tools, built to launch before the deadline.

AWARDS

We don't have a trophy shelf (remote company). But if we did, it'd look like this.

Clutch Top Web Agency
in Poland

HubSpot Solutions
Provider

Semrush Certified
Expert

CSS Design Awards Honorable Mention x2

Webflow Premium
Partner

Awwwards Honorable Mention x2

Testimonials

The nice things partners say about us

Burned CMOs and founders usually come to us highly skeptical and traumatized by past agencies or freelancers. Here's what happens after they experience actual predictability.

50+

Enterprise clients signed from the website

"They have truly transformed our marketing landscape."

Drew Danner

Managing Director, BD EMERSON

Explore case study

+300%

Organic search traffic increase after redesign.

“Working with Foursets was a transformative experience for Setproduct."

Roman Kamushken

Founder, Setproduct

Explore case study

2x

ICP conversion increased.

"We are very happy with their service."

Kateryna Dmytriyeva

Growth Manager, CIM

Explore case study

35%

Lead-to-client conversion rate from website.

"They had a strong knowledge of all aspects and provided a great thought partner to execute the goals."

Jeff Reed

Founder & CEO, Momentum Studios

Explore case study

50%

Increase in qualified leads post-launch.

“Their white-glove service is impressive.”

Orit Benzaquen

CEO, Penti

Explore case study

4.9 stars, 30 reviews

Webflow Premium
Partner & Expert

Your next feature live, documented, with a date on it

Send us the task. Nick replies with an estimate in hours and a date for the live URL, and the code ships with a record of where it lives.

Get a date for my feature

The Stats

Proof over promises

Company-wide numbers from our own delivery records.

100+

B2B Webflow websites designed, built, and launched since 2021.

96.8%

On-time delivery rate since 2021.

Zero

Third parties with access to your codebase. Every developer at Foursets is a full-time employee.

20

Senior team members, all full-time and in-house. Every task gets a named developer on it from the estimate onward.

13

Industries served, including SaaS, Cybersecurity, and Fintech.

25+

Countries where our clients work, including the US, Australia, the UK, and Germany.

OTHER SERVICES

Other Services

Webflow Development

Webflow Migration

Webflow Maintenance

SEO Services

Web Design

How do I embed custom code in Webflow?

Code lives in three places. The embed element sits on the Webflow canvas and belongs to one spot in the layout. Page settings hold head code and a before-body-close field for that single page. The custom code section in site settings holds the same pair for every page at once. Choosing correctly between the three keeps the site fast and the code findable a year later.