Custom Quill Integration for CMS: Delta, Image Upload & Modules

In a Next.js 14 project, we needed a rich-text editor for a CMS admin panel handling up to 5000 records. The standard Quill 2.x didn't fit: its toolbar couldn't upload images to the server, and table formatting was missing—we'd have to store base64 strings, inflating document size by 30–50%. The built-in modules provided only basic features, but a real product required custom handlers and Delta format support. We developed custom modules that integrate with React and Vue. Let me walk you through the challenges we encountered and how we solved them.

Why Basic Quill Doesn't Suit CMS

A typical Quill setup gives basic functionality, but in production you run into issues:

• Image upload. By default, Quill embeds images as base64, bloating JSON by 30–50%. We write a custom handler that uploads the file to the server and inserts the URL. This reduces database load and speeds up page loading.
• Custom modules: tables, nested lists, text color. Quill is extendable via third-party plugins, but they aren't always stable. For one project, we had to write a module for nested lists because the ready-made one didn't support depths beyond 2 levels.
• Saving in Delta vs HTML. Delta is convenient for versioning and collaborative editing, but HTML is often needed for output. We provide both by converting Delta to HTML using quill-delta-to-html.

How We Integrate Quill with Custom Modules

Our process includes:

1. Analyze editor requirements: buttons, formats, media upload, mobile support.
2. Design modules: custom handlers, theme (snow/bubble or custom), toolbar configuration.
3. Implementation: code in React (react-quill-new), Vue, or vanilla JS. Example custom image handler:

const imageHandler = () => {
    const input = document.createElement('input');
    input.setAttribute('type', 'file');
    input.setAttribute('accept', 'image/*');
    input.click();

    input.onchange = async () => {
        const file = input.files[0];
        const formData = new FormData();
        formData.append('image', file);

        const response = await fetch('/api/media/upload', {
            method: 'POST',
            body: formData
        });
        const { url } = await response.json();

        const quill = quillRef.current.getEditor();
        const range = quill.getSelection(true);
        quill.insertEmbed(range.index, 'image', url);
    };
};

const MODULES = {
    toolbar: {
        container: [...],
        handlers: { image: imageHandler }
    }
};

4. Test on all devices and browsers (Chrome, Firefox, Safari, Edge). Verify SSR correctness, image upload, Delta->HTML conversion.
5. Deploy and document. We deliver source code, setup instructions, and three months of support.

What Delta Format Offers

Delta is an array of operations (insert, delete, retain) that is easy to store, transmit, and transform. Unlike HTML, Delta preserves formatting semantics: each style is stored as an operation attribute. This enables undo/redo at any step, collaborative editing via OT algorithms, and automatic merge of changes. As described in the Delta format documentation, a Delta object is typically 40% smaller than equivalent HTML for the same content. If your project requires versioning, Delta is the right choice.

Comparison with Alternatives

Quill wins on load speed and simplicity. If you don't need complex nested blocks, it's the best choice. If unsure, contact us for a free consultation.

How to Avoid Common Integration Mistakes

• Forgetting to disable SSR for Quill in Next.js gives document is not defined. Use dynamic import with ssr: false.
• Using outdated react-quill instead of react-quill-new (the latter supports React 18 and SSR correctly).
• Not wrapping handlers in useCallback—infinite re-renders.
• Confusing Delta and HTML: inserting HTML via setContents loses formatting. Use clipboard.dangerouslyPasteHTML or conversion.

What's Included in the Integration Work

• Requirements analysis and stack choice (React, Vue, or Next.js)
• Toolbar, modules, theme configuration
• Custom image upload handler
• Export to HTML and/or Delta
• Hook integration (onChange, onBlur, validation)
• Documentation and team training
• Code warranty (3 months free support)

Timeline and Cost

Integration of Quill with custom modules takes 1 to 3 days depending on complexity. The cost is calculated individually after brief. On average, such integration is 30–50% cheaper than licensing commercial editors. Get a free engineer consultation—contact us to evaluate your project.

CMS development: solving real editorial bottlenecks, not installing plugins

A news publisher had a WordPress site with 5 editors. Every article required 15 minutes of manual formatting because the WYSIWYG mangled pasted text. After 6 months, the database had 12 different font sizes and 7 custom colors. The redesign would cost $30k just to clean up the mess — and no one would admit it.

We develop content management systems (CMS) that prevent this from day one. Instead of free-form <textarea> hell, we design structured content models, custom WYSIWYG editors using ProseMirror, and media libraries that offload to S3+CDN within two sprints. This is CMS development without shortcuts.

When is headless CMS justified and when not?

Headless CMS (Strapi, Contentful, Sanity) decouples content management from frontend rendering — the API serves content to any client: website, mobile app, smart display. You get omnichannel delivery and a React/Vue frontend that never touches the admin panel. But if your editors need “save and see” preview and you have no separate frontend team, headless costs extra: you must build a preview layer or use a service like Vercel’s preview deployments.

Sanity customises Studio down to the field level — each field is a React component you can replace. Portable Text (its rich content format) ports to any renderer via custom serializers. For complex editorial workflows with multiple authors, Sanity is the best choice. Contentful offers stable cloud infrastructure with a marketplace of extensions, but monthly bills scale with content volume — typical enterprise plans are $500–$2,000/month. Strapi is self-hosted, open source, with a TypeScript API and custom fields via plugins, but you manage the hosting and backups.

Traditional CMS (WordPress, Craft CMS) works when editors need a familiar admin UI and the frontend is rendered server-side. Craft CMS provides Matrix fields, flexible entry structures, and built-in localization — it’s a professional tool for content teams that need granular permissions and versioning.

How do we build a WYSIWYG editor that doesn’t break layout?

The editor is the most complex component — not a <textarea>. The sweet spot is Tiptap, built on ProseMirror. Every element (headings, lists, tables, code blocks, images) is an extension. Collaborative editing via Yjs works out of the box. Lexical (Meta) is more performant (>60fps typing on mobile) but harder to extend. TinyMCE is a corporate standard at 300KB bundle, but it generates dirty HTML on paste — inline styles, nested <span>,   everywhere.

The root cause: pasting from Word. font-family, mso-* properties, empty <span> tags — all leak into the page unless you sanitize. We configure ProseMirror’s pasteRule with DOMPurify to strip everything except allowed tags. Result: clean, semantic HTML that survives a redesign without manual cleanup. Editors save 2–4 hours per week per person.

Media library: from upload to CDN with transformation

Saving files to the server disk is the classic mistake. The disk fills, scaling fails, and CDN becomes impossible. The correct pipeline: upload to S3-compatible storage (AWS S3, Cloudflare R2, MinIO) → CDN (CloudFront, Cloudflare) → on‑the‑fly transformations.

Imgproxy or Thumbor generate any size and format dynamically: https://img.example.com/resize:800:600/format:webp/plain/s3://bucket/photo.jpg. The original lives once, derivatives never occupy disk. Cloudflare Images costs $5 per 100k images, including transformations. Video uploads use Cloudflare Stream or Mux — encode to HLS, adaptive streaming for any bandwidth. Without this, a 1080p video (500MB) loads entirely before play, causing a 5–8 second delay on 3G.

What’s included in media library development

Why structured content outperforms free-form HTML

Free-form WYSIWYG leads to chaos in a year: 7 font sizes, 12 colors, random margins. Redesign requires manual cleanup of thousands of posts. Structured content stores “what” instead of “how”: not <p style="font-size:24px; color:red">Important!</p>, but a callout block with variant: warning. The CMS stores the structure; the frontend decides rendering. Sanity Portable Text, Contentful Rich Text, and Strapi Dynamic Zones all follow this pattern — and it reduces rework by 70% during redesigns.

Work process

1. Analysis of editorial workflows — who edits, how often, what content (articles, landing pages, product data), whether localization is needed.
2. CMS selection — based on scenarios, not trends. We compare headless vs traditional with a weighted matrix.
3. Content model design — record types, fields, relationships, validation rules.
4. Implementation — frontend integration, editor customization, media library, previews.
5. Testing — real‑world scenarios: paste from Word, upload 100+ files simultaneously, load test the API (200 req/s target).
6. Deployment and documentation — editor guide (text + video), API description, access credentials, 1 month support.

Timelines and budget

Budget is calculated individually after an audit. Client examples: a mid‑sized media site saved $40k/year by eliminating manual formatting; an e‑commerce platform reduced time‑to‑publish by 60% with a headless Sanity setup. Contact us for a free project estimate.

What you get after delivery

• Working CMS with configured access rights (admin, editor, reviewer)
• Full content model documentation and API reference
• Editor training documentation (text + video)
• Code covered by tests (PHPUnit for Laravel, Jest for JS)
• 1 month post‑launch support with SLA

Our experience and guarantees

Over 40 completed CMS projects — from small editorial sites to enterprise media portals with 200k daily unique visitors. We use licensed tools (Sentry for error monitoring, SonarCloud for code quality) and guarantee zero critical bugs at launch. All code is version‑controlled and deployable via CI/CD.

For your specific needs, contact us to discuss requirements. We’ll provide a technical proposal within 2 business days.