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Data Appending

B2B Data Appending to Fill the Gaps in Your Data

Data Appending fills in missing email addresses and phone numbers in your existing CRM records through a reliable B2B Data Appending service, with API access available when needed.

  • Fill missing emails and phones

  • Append updated contact details

  • Connect with prospects globally

  • Stay GDPR compliant

Why Data Appending Matters

Work with the lists you already have. B2B Data Appending lets you quickly add missing emails and phone numbers to your CRM, so you reach more prospects and customers with less manual effort.

Repair gaps – Add missing email addresses or phone numbers to your records

Speed up outreach – Save time for sales, growth, and marketing teams by filling out complete contact data

Stay current – Keep your records relevant with verified, up-to-date contact details

Simple workflow – Just upload your file or connect via our data append API

Privacy ensured – Only verified, privacy-compliant business data used

Data Appending

Add Missing Contact Data in Minutes

Stop wasting time searching one-by-one for missing details. Our Data Appending Services fill your customer or lead lists with verified business emails and phone numbers — so you can get to work right away.

Email Appending – Add business email addresses to existing contact records

Phone Appending – Get business phone numbers added for every matched entry

Contact completion – Fill in missing fields using official sources

Quick and easy process – Upload your list or use our data append API

No guesswork – Only verified information included in your delivery

Data Appending

Trusted Results

Dependable Data Appending from Verified Sources

Our B2B Data Appending solution uses trusted business sources—official records, trade registries, and reputable data providers—so you receive only accurate and compliant contact information.

Privacy Compliant – Follows all local and international rules

Global Coverage – Phone and email appending for companies in 195+ countries

Verified Accuracy – Every business detail checked for quality before delivery

Data Appending

Powering Website Visitor Identification with Data Appending

Lead Forensics needed a reliable way to scale its website visitor identification platform with accurate and complete company data. As a fast growing B2B software provider, missing or outdated data limited how effectively they could turn anonymous website visitors into qualified leads.

Lead Forensics helps sales teams identify website visitors by matching visits to company records and contact details. To do this at scale, they required a company database with broad website coverage and consistent data quality. Finding GDPR compliant sources with reliable URLs remained a major challenge.

With our Data Appending Services, Lead Forensics was able to append missing data fields to their existing datasets. We delivered a custom selection of ten million small and mid sized European companies, including verified website URLs, refreshed monthly and provided via the data append API in JSON format.

By using B2B Data Appending, Lead Forensics could maintain accurate coverage, reduce data gaps, and support their customers with better identification results. This scalable approach allowed their platform to grow while keeping data reliable, compliant, and easy to maintain.

Your team can achieve similar results by using Data Appending to complete your lists with missing website, email appending, or phone appending fields and keep your datasets ready for growth.

Test Data Appending

Get a Free Data Audit

Upload your list and find out exactly which emails and phone numbers are missing. We will give you a clear report and a quote so you see how Data Appending can fill the gaps in your CRM records.

Data Fields

Complete your business contacts — fill in every gap.

From missing email addresses to phone numbers — our Data Appending solution fills in the contact details your team needs to connect and grow.

Company Name Addresses Email Address Phone Number Mobile Phone Country Postal Code Website
Company Name Addresses Email Address Phone Number Mobile Phone Country Postal Code Website
Contact Name Job Title Location Direct Phone Business Email CRM ID
Contact Name Job Title Location Direct Phone Business Email CRM ID

Data Appending

How It Works

Data Appending is straightforward. Just upload your existing list and let us handle the rest. We fill in missing email addresses and phone numbers, making sure your contact data is accurate and ready for your next campaign. Get a free audit, a transparent quote, and your completed list delivered fast.

  • We align with your team

    We connect with your marketing or sales team to understand which contact details are missing and your main outreach goals.

  • You get a free audit

    We scan your uploaded list and show exactly which email addresses and phone numbers can be found for Data Appending. You’ll see a clear summary and a tailored quote.

  • We match data for you

    Using our data append API and verified databases, we add missing contact details so your lists are ready to use. Our process ensures reliable results for B2B Data Appending.

  • We deliver your appended file

    Your appended list is returned in the format you choose, with added email addresses and phone numbers for fast action by your team.

  • You deliver better outreach

    With more complete contact data, your teams can contact more leads, create better campaigns, and drive results—without delay or wasted effort.

Before You Start Data Appending

Data Appending is made for marketing, sales, and growth teams who need to complete their existing CRM or lead lists. Simply upload your current database and quickly fill in missing email addresses or phone numbers. With our B2B Data Appending Services, you can make sure your records are ready for outreach without manual research or guesswork.

The more complete your file, the higher the match rates for email appending and phone appending. We provide a secure upload link for your data and handle all details with care.

  • Free audit available for companies with an active website
  • Minimum 5,000 records per file
  • Match rates depend on list quality and available fields
  • Results delivered as Excel or CSV for easy import
  • Need a brand new list? Try the Bold Platform to build from scratch

Get Your Free Appending Audit

Fill in your details and upload a sample of your data. Our team will review your file and send you a free audit — showing exactly what we can append, along with a tailored quote.

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