Bulk Phone Validator

Upload your contact list in CSV or Excel format and validate thousands of phone numbers instantly. Clean your database, detect carriers and line types, and export results in minutes.

Drop your CSV or Excel file here

Or click to browse. Max 10 MB, 1000 rows.

We do not store or retain phone numbers from your uploads. All data is processed securely and deleted immediately after validation completes.

Clean Your Phone List in Three Steps

Upload, validate, download. No sign-up required.

Upload Your File

Drag and drop your CSV or Excel file containing phone numbers. Our tool automatically detects the phone column and prepares for validation.

Supports CSV and XLSX formats
Auto-detects phone number columns
Handles mixed number formats
Works with or without country codes

Validate in Bulk

We process your entire file in seconds, checking each number against international standards, carrier databases, and numbering plans.

Format validation for 200+ countries
Carrier and line type detection
Automatic country identification
E.164 format conversion
Real-time progress tracking

Review & Export Results

Get comprehensive validation results with all metadata. Download as CSV or Excel, then import back into your CRM or database.

Valid/invalid status for each number
Carrier information included
Line type (mobile, landline, VoIP)
Multiple format outputs
Filter by validity status
Export with all metadata

Why Validate Phone Numbers in Bulk?

Invalid phone numbers drain your budget, waste your team's time, and tank your campaign performance. FoneSwift's Bulk Phone Validator lets you clean thousands of contacts in minutes, not weeks of manual work.

Upload a CSV or Excel file with your contact list and we'll validate every number against international standards, detect carriers, identify line types (mobile, landline, VoIP), and flag invalid entries. Get detailed results with carrier info, country detection, and multiple format outputs all in one place.

Most teams waste 30-40% of their SMS and voice budget on invalid, inactive, or misformatted numbers. A single bulk validation cuts that waste dramatically. You'll see immediate improvements in SMS delivery rates, call connection rates, and overall campaign ROI.

The free tier handles up to 1000 rows or 10 MB per upload, perfect for testing and small-to-medium lists. No sign-up required. For larger files, API access, and real-time HLR lookup, check our paid plans. Privacy-first design means your numbers never get stored or logged.

Bulk CSV/XLSX Upload

Upload your contact lists directly via CSV or Excel file. Validate hundreds or thousands of phone numbers in seconds without manual formatting.

Lightning-Fast Processing

Validate entire contact databases in minutes. Get detailed results for every number with carrier, format, and line type detection at scale.

Export & Integration

Download validated results as CSV or Excel with all metadata included. Seamlessly import back into your CRM, marketing platform, or database.

Integrate With Your Entire Phone Workflow

Validate, dial, message, and track all from one platform.

Power Dialer

Maximize sales team productivity with automated dialing, intelligent call distribution, and real-time analytics

Learn more

SMS & Messaging

Two-way business texting, automated campaigns, and omnichannel messaging from phone numbers in 100+ countries

Learn more

Local Phone Numbers by State

Get local phone numbers for any state in the US. Ideal for local marketing campaigns and outreach.

Learn more

Who Needs Bulk Phone Validation?

From sales teams to marketing ops, clean data improves every workflow

Clean Your Contact Database

Remove invalid numbers from your CRM to improve campaign deliverability and reduce messaging costs across all channels.

Reduce SMS bounce rates by 90%+
Improve email-to-SMS conversions
Save thousands on wasted messaging
Maintain database hygiene

Migrate Between Systems

Standardize and validate phone numbers when moving from one CRM to another, ensuring data integrity throughout migration.

Standardize to E.164 format
Detect and remove duplicates
Fix formatting inconsistencies
Verify data before import

List Building & Lead Gen

Validate newly acquired lead lists before importing to ensure quality and maximize your lead generation ROI.

Filter out fake or invalid leads
Improve lead quality scores
Reduce wasted follow-up time
Better conversion tracking

Sales Campaign Prep

Validate phone numbers before launching outbound campaigns to maximize call connect rates and sales team productivity.

Higher call connection rates
Reduce wasted dial attempts
Boost sales team efficiency
Better lead qualification

Marketing Campaign Setup

Ensure all phone numbers in your SMS or voice campaign are valid before launch to maximize deliverability.

Maximize campaign reach
Meet compliance requirements
Reduce carrier filtering
Improve campaign ROI

Data Compliance & Audits

Verify your contact lists meet regulatory standards and maintain accurate records for compliance audits.

Meet TCPA requirements
Maintain audit trails
Reduce compliance risk
Document validation dates

What You Should Know

Free tier limited to 1000 rows or 10 MB per upload.

Validates format and line type but not real-time network reachability.

For live HLR status checks, upgrade to our enterprise platform.

Processing speed depends on file size and server capacity.

Frequently Asked Questions

What file formats does the bulk validator support?

We support both CSV and XLSX (Excel) files. Simply upload your contact list with phone numbers in any column. Our tool auto-detects the phone number column and validates all entries.

What is the file size limit for uploads?

The free tier supports up to 10 MB or 1000 rows of data, whichever limit you reach first. This allows you to validate roughly 5,000 to 10,000 phone numbers depending on file structure. For larger lists, upgrade to an enterprise plan.

How long does bulk validation take?

Most lists validate in seconds to minutes depending on size and complexity. A 1,000-number list typically processes in under 30 seconds. Larger enterprise batches are prioritized in our processing queue.

Can I download the validated results?

Yes, download your validated results as CSV or Excel with all metadata columns included. Results include validity status, carrier info, line type, country, and formatted versions (E.164, international, national).

Do you store the phone numbers from my upload?

No, we do not store or retain phone numbers after validation completes. Your data is processed securely and deleted immediately after results are generated. Privacy is built into our platform.

How accurate is the bulk validation?

We use industry-standard libraries like libphonenumber and carrier databases for consistent accuracy. Format validation and carrier detection are highly reliable. For real-time network status (HLR lookup), use our paid platform.

Can I validate international phone numbers in bulk?

Absolutely. Our bulk validator supports phone numbers from over 200 countries. Upload numbers in any format with or without country codes, and we automatically detect the country and validate accordingly.

What happens if my file has mixed formats?

No problem. Our validator handles mixed formats automatically, detecting whether numbers include country codes, parentheses, dashes, or spaces. Each number is normalized and validated independently.

Can I schedule recurring bulk validations?

The free tool runs on-demand. For automated, scheduled validations and API-based workflows, check out our enterprise plans which offer recurring batch jobs and webhook integrations.

How do I use bulk validation for list cleaning?

Upload your contact list, validate all numbers, then download the results filtered by validity status. Remove all invalid entries, keep only valid numbers, and re-import the cleaned list into your CRM to improve deliverability.

Explore More Free Tools

Complete your workflow with our full suite of phone number utilities

Phone Number Validator

Verify phone number validity, carrier, and location instantly. Clean your lists and improve connection rates. Supports 200+ countries with E.164 format conversion.

Verify Validity
Format Detection
Global Coverage

Try Tool

Call Transcript Redactor (PII-Safe)

Redact sensitive data from call transcripts instantly. Remove personally identifiable information (PII), and payment details. GDPR and TCPA compliant. Free for up to 5,000 characters.

PII Redaction
Compliance Ready
Payment Details Redaction

Try Tool

People love FoneSwift

Results from industry leaders

100+

Businesses use FoneSwift daily

2000+

Calls processed daily

500+

Calls handled by AI

24/7

Customer support

50+

Integrations available

"We had 25,000 legacy phone numbers in our database. Using the bulk validator, we identified 4,200 invalid numbers in under 5 minutes. After cleaning, our SMS delivery rate jumped from 87% to 96%, saving us $800 monthly on wasted messages."

Rachel Thompson

VP of Marketing Operations, TechFlow Solutions

"As a lead gen agency, data quality makes or breaks our business. The bulk validator lets us clean 50,000+ contacts monthly. Our clients love the accuracy, and we have built it into our workflow. Best investment ever."

Michael Brown

Founder, Precision Lead Acquisition

"We migrated from Salesforce to HubSpot and our phone numbers were a mess. Mixed formats, duplicates, invalid entries everywhere. Bulk validation saved us weeks of manual cleanup. We validated 30,000 numbers in hours and the export was perfect."